第五章 锁存器和触发器

relationship between Government and business. The \ssions\General Secretary of \ar\d succinctly summarized the new relationship between Government and business, as pure politics, reshaping the political relationship specified in the direction. District leaders in handling political and business relations, engage in trading power for money, and finally stumbled, we a lesson, always keep in mind that \ean\cticing \o\a sincere engagement with private enterprise to help solve practical difficulties; \clarify the Division of power, exercised in accordance with, private entrepreneurs with innocent purity, not abusing power for personal gain, not to engage in trading power for money. Third, in order to maintain fairness and justice. Fairness and justice is the lifeline of the rule of law, is the best development environment. Currently, lax law enforcement and the judicial sector in our region also exist to varying degrees, lawenforcement departments and individual window units power for personal gains and bribes, thick friends, relations, human cases, money cases in which seriously infringe on the legitimate rights and interests of enterprises and people. Especially some law enforcement and inspection for profit purposes, deliberately looking for corporate loopholes, found directly under the ticket does not give business improvement opportunities. We recruit a company doesn't easily, cultivating a business more difficult, never for personal gain, systematic harassment, card, last checked to check to get the enterprise collapsed. o guarantee the legitimate rights and interests. Always proceed from the overall situation of reform and development of services, fully consider the characteristics of production and management in non-public enterprises and social benefits, an accurate grasp of legal limits, protect the enthusiasm of entrepreneurs and practitioners in innovation and entrepreneurship, enhancingexpectations and confidence. To promote strict enforcement. Strengthening law enforcement procedures, improve law enforcement performance evaluation, strengthening the supervision of law enforcement, exploration and practice of risk control mechanism of law enforcement to further standardize the social security, urban management, road traffic administrative law enforcement, effectively free, extensive law-enforcement and lax enforcement of law enforcement and other issues. o uphold justice. Justice is the last line of Defense to safeguard fairness and justice, to unequivocally support the courts and procuratorates independently exercise level ... Judicial activities were rampant, must not be allowed to run, favors, money, must not be allowed to knowingly violate the miscarriage, violations of the legitimate rights and interests of the masses must not be allowed to abuse of power, to make forest mass can be felt in every judicial cases in equity and justice. Four to deepen grass-roots governance according to law第五章 锁存器和触发器

第十五讲 教学内容： ①基本RS触发器的构成及其工作原理；②时钟控制触发器的应用点及其工作原理；③主从触发器和边沿触发器的构成及JK触发器

和D触发器的应用。

教学要求：① 掌握两器件的工作原理；② 熟悉两器件的应用。 教学难点：①主从触发器和边沿触发器的构成特点及其工作原理；②JK触

发器和D触发器的应用。

这一章，介绍一种新的逻辑部件--触发器。触发器的“新”在于它具有“记忆”功能，它是构成时序逻辑电路的基本单元。本章首先介绍基本RS触发器的组成原理、特点和逻辑功能。然后引出能够防止“空翻”现象的主从触发器和边沿触发器。同时，较详细地讨论RS触发器、JK触发器、D触发器、T触发器、T＇触发器的逻辑功能及其描述方法。最后，通过一个实例帮你进一步体会触发器的“记忆”功能。

5.1 基本触发器

一． 基本RS触发器

1．用与非门组成的基本RS触发器

（1）电路结构。由两个与非门的输入输出端交叉耦合。它与组合电路的根本区别在于，电路中有反馈线。

QQQQG1&&G2RSR(a)S(b)

图5.1.1 与非门组成的基本RS触发器 （a）逻辑图 （b）逻辑符号

它有二个输入端R、S，有两个输出端Q、Q。一般情况下，Q、Q是互补的。 定义：当Q＝1，Q＝0时，称为触发器的1状态； 当Q＝0，Q＝1时，称为触发器的0状态。 （2）逻辑功能表。 R S 0 0 0 0 Qn 0 1 Qn+1 × × 功能说明 不稳定状态 rass-roots governance according to law is an important foundation for promoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. o promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone %unspoken rules\ lawabide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, stronglyagainst violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well as dispute resolution mechanisms, implement fully the petitioners ' cases \d-party\nd supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution \not to\oblem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulserelationship between Government and business. The \ssions\General Secretary of \ar\d succinctly summarized the new relationship between Government and business, as pure politics, reshaping the political relationship specified in the direction. District leaders in handling political and business relations, engage in trading power for money, and finally stumbled, we a lesson, always keep in mind that \ean\cticing \clear\o\a sincere engagement with private enterprise to help solve practical difficulties; \clarify the Division of power, exercised in accordance with, private entrepreneurs with innocent purity, not abusing power for personal gain, not to engage in trading power for money. Third, in order to maintain fairness and justice. Fairness and justice is the lifeline of the rule of law, is the best development environment. Currently, lax law enforcement and the judicial sector in our region also exist to varying degrees, lawenforcement departments and individual window units power for personal gains and bribes, thick friends, relations, human cases, money cases in which seriously infringe on the legitimate rights and interests of enterprises and people. Especially some law enforcement and inspection for profit purposes, deliberately looking for corporate loopholes, found directly under the ticket does not give business improvement opportunities. We recruit a company doesn't easily, cultivating a business more difficult, never for personal gain, systematic harassment, card, last checked to check to get the enterprise collapsed. o guarantee the legitimate rights and interests. Always proceed from the overall situation of reform and development of services, fully consider the characteristics of production and management in non-public enterprises and social benefits, an accurate grasp of legal limits, protect the enthusiasm of entrepreneurs and practitioners in innovation and entrepreneurship, enhancingexpectations and confidence. To promote strict enforcement. Strengthening law enforcement procedures, improve law enforcement performance evaluation, strengthening the supervision of law enforcement, exploration and practice of risk control mechanism of law enforcement to further standardize the social security, urban management, road traffic administrative law enforcement, effectively free, extensive law-enforcement and lax enforcement of law enforcement and other issues. o uphold justice. Justice is the last line of Defense to safeguard fairness and justice, to unequivocally support the courts and procuratorates independently exercise level ... Judicial activities were rampant, must not be allowed to run, favors, money, must not be allowed to knowingly violate the miscarriage, violations of the legitimate rights and interests of the masses must not be allowed to abuse of power, to make forest mass can be felt in every judicial cases in equity and justice. Four to deepen grass-roots governance according to law 0 1 0 1 1 0 1 0 1 1 1 1 0 1 0 1 0 1 0 0 1 1 0 1 置0（复位） 置1（置位） 保持原状态

n+1

可见，触发器的新状态Q（也称次态）不仅与输入状态有关，也与触发器原来的状态Qn（也称现态或初态）有关。 触发器的特点：

① 有两个互补的输出端，有两个稳态。

② 有复位（Q=0）、置位（Q=1）、保持原状态三种功能。

③ R为复位输入端，S为置位输入端，该电路为低电平有效。

④ 由于反馈线的存在，无论是复位还是置位，有效信号只须作用很短的一段时间。即“一触即发”。

（3）波形分析。 例5.1.1 用与非门组成的基本RS触发器如图5.1.1（a）所示，设初始状态为0，已知输入R、S的波形图如图5.1.2，画出输出Q、Q的波形图。

解：由表5.1.1可画出输出Q、Q的波形如图5.1.2所示。 图中虚线所示为考虑门电路的延迟时间的情况。

图5.1.2 例5.1.1波形图

RStpdQ2tpdQ 2．用或非门组成的基本RS触发器（自学）

综上所述，基本RS触发器具有复位（Q=0）、置位（Q=1）、保持原状态三种功能，R为复位输入端，S为置位输入端，可以是低电平有效，也可以是高电平有效，取决于触发器的结构。

二． 同步RS触发器

在实际应用中，触发器的工作状态不仅要由R、S端的信号来决定，而且还希望触发器按一定的节拍翻转。为此，给触发器加一个时钟控制端CP，只有在CP端上出现时钟脉冲时，触发器的状态才能变化。具有时钟脉冲控制的触发器状态的改变与时钟脉冲同步，所以称为同步触发器。

1．同步RS触发器的电路结构 2．逻辑功能

当CP＝0时，控制门G3、G4关闭，都输出1。这时，不管R端和S端的信号如何变化，

rass-roots governance according to law is an important foundation for promoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to lawpromote the continuous improvement of the social environment. o promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone %unspoken rules\ lawabide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, stronglyagainst violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well as dispute resolution mechanisms, implement fully the petitioners ' cases \d-party\nd supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution \not to\oblem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulserelationship between Government and business. The \ssions\General Secretary of \ar\d succinctly summarized the new relationship between Government and business, as pure politics, reshaping the political relationship specified in the direction. District leaders in handling political and business relations, engage in trading power for money, and finally stumbled, we a lesson, always keep in mind that \ean\cticing \o\a sincere engagement with private enterprise to help solve practical difficulties; \clarify the Division of power, exercised in accordance with, private entrepreneurs with innocent purity, not abusing power for personal gain, not to engage in trading power for money. Third, in order to maintain fairness and justice. Fairness and justice is the lifeline of the rule of law, is he best development environment. Currently, lax law enforcement and the judicial sector in our region also exist to varying degrees, lawenforcement departments and individual window units power for personal gains and bribes, thick friends, relations, human cases, money cases in which seriously infringe on the legitimate rights and interests of enterprises and people. Especially some law enforcement and inspection for profit purposes, deliberately looking for corporate loopholes, found directly under the ticket does not give business improvement opportunities. We recruit a company doesn't easily, cultivating a business more difficult, never for personal gain, systematic harassment, card, last checked to check to get the enterprise collapsed. o guarantee the legitimate rights and interests. Always proceed from the overall situation of reform and development of services, fully consider the characteristics of production and management in non-public enterprises and social benefits, an accurate grasp of legal limits, protect the enthusiasm of entrepreneurs and practitioners in innovation and entrepreneurship, enhancingexpectations and confidence. To promote strict enforcement. Strengthening law enforcement procedures, improve law enforcement performance evaluation, strengthening the supervision of law enforcement, exploration and practice of risk control mechanism of law enforcement to further standardize the social security, urban management, road traffic administrative law enforcement, effectively free, extensive law-enforcement and lax enforcement of law enforcement and other issues. o uphold justice. Justice is the last line of Defense to safeguard fairness and justice, to unequivocally support the courts and procuratorates independently exercise level ... Judicial activities were rampant, must not be allowed to run, favors, money, must not be allowed to knowingly violate the miscarriage, violations of the legitimate rights and interests of the masses must not be allowed to abuse of power, to make forest mass can be felt in every judicial cases in equity and justice. Four to deepen grass-roots governance according to law触发器的状态保持不变。

当CP＝1时，G3、G4打开，R、S端的输入信号才能通过这两个门，使基本RS触发器的状态翻转，其输出状态由R、S端的输入信号决定。见表5.1.3。

QQQG1&&G2QG3&&G41RC11SCPRCP(a)S(b)

图5.1.5 同步RS触发器 （a）逻辑图 （b）逻辑符号

表5.1.3 同步RS触发器的功能表

R S 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 Qn 0 1 0 1 0 1 0 1 Qn+1 0 1 1 1 0 0 × × 输出状态不稳定 输出状态与S状态相同 输出状态与S状态相同 功能说明 保持原状态

由此可以看出，同步RS触发器的状态转换分别由R、S和CP控制，其中，R、S控制状态转换的方向，即转换为何种次态；CP控制状态转换的时刻，即何时发生转换。

3．触发器功能的几种表示方法

（1）特性方程。 触发器次态Qn+1与输入状态R、S及现态Qn之间关系的逻辑表达式称为触发器的特性方程。根据表5.1.3可画出同步RS触发器Qn+1的卡诺图，如图5.1.6所示。由此可得同步RS触发器的特性方程为：

n?1n Q?S?RQ

RS=0 （约束条件） （2）状态转换图

状态转换图表示触发器从一个状态变化到另一个状态或保持原状不变时，对输入信号的要求。

rass-roots governance according to law is an important foundation for promoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to law, promote the continuous improvement of the social environment. o promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone %unspoken rules\ lawabide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, stronglyagainst violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well as dispute resolution mechanisms, implement fully the petitioners ' cases \d-party\nd supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution \not to\oblem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulserelationship between Government and business. The \ssions\General Secretary of \ar\d succinctly summarized the new relationship between Government and business, as pure politics, reshaping the political relationship specified in the direction. District leaders in handling political and business relations, engage in trading power for money, and finally stumbled, we a lesson, always keep in mind that \ean\cticing \clear\o\a sincere engagement with private enterprise to help solve practical difficulties; \clarify the Division of power, exercised in accordance with, private entrepreneurs with innocent purity, not abusing power for personal gain, not to engage in trading power for money. Third, in order to maintain fairness and justice. Fairness and justice is the lifeline of the rule of law, is the best development environment. Currently, lax law enforcement and the judicial sector in our region also exist to varying degrees, lawenforcement departments and individual window units power for personal gains and bribes, thick friends, relations, human cases, money cases in which seriously infringe on the legitimate rights and interests of enterprises and people. Especially some law enforcement and inspection for profit purposes, deliberately looking for corporate loopholes, found directly under the ticket does not give business improvement opportunities. We recruit a company doesn't easily, cultivating a business more difficult, never for personal gain, systematic harassment, card, last checked to check to get the enterprise collapsed. o guarantee the legitimate rights and interests. Always proceed from the overall situation of reform and development of services, fully consider the characteristics of production and management in non-public enterprises and social benefits, an accurate grasp of legal limits, protect the enthusiasm of entrepreneurs and practitioners in innovation and entrepreneurship, enhancingexpectations and confidence. To promote strict enforcement. Strengthening law enforcement procedures, improve law enforcement performance evaluation, strengthening the supervision of law enforcement, exploration and practice of risk control mechanism of law enforcement to further standardize the social security, urban management, road traffic administrative law enforcement, effectively free, extensive law-enforcement and lax enforcement of law enforcement and other issues. o uphold justice. Justice is the last line of Defense to safeguard fairness and justice, to unequivocally support the courts and procuratorates independently exercise level ... Judicial activities were rampant, must not be allowed to run, favors, money, must not be allowed to knowingly violate the miscarriage, violations of the legitimate rights and interests of the masses must not be allowed to abuse of power, to make forest mass can be felt in every judicial cases in equity and justice. Four to deepen grass-roots governance according to law

Qn+1R=0S=1SQ00R0010n0110111?á101?áR=?áS=001R=0S=?áR=1S=0n+1

图5.1.6 同步RS触发器Q的卡诺图 图5.1.7 同步RS触发器的状态转换图

（3）驱动表

驱动表是用表格的方式表示触发器从一个状态变化到另一个状态或保持原状态不变时，对输入信号的要求。表5.1.4所示是根据表5.1.3画出的同步RS触发器的驱动表。驱动表对时序逻辑电路的设计是很有用的。

（4）波形图

触发器的功能也可以用输入输出波形图直观地表示出来，图5.1.8所示为同步RS触发器的波形图。

CPSRQQ

图5.1.8 同步RS触发器的波形图

4．同步触发器存在的问题——空翻

在一个时钟周期的整个高电平期间或整个低电平期间都能接收输入信号并改变状态的触发方式称为电平触发。由此引起的在一个时钟脉冲周期中，触发器发生多次翻转的现象叫做空翻。空翻是一种有害的现象，它使得时序电路不能按时钟节拍工作，造成系统的误动作。

造成空翻现象的原因是同步触发器结构的不完善，下面将讨论的几种无空翻的触发器，都是从结构上采取措施，从而克服了空翻现象。

rass-roots governance according to law is an important foundation for promoting the construction of rule of law, but also the most basic development environment. Despite my good social order in General, but there are law-abiding consciousness, social order is not standard, regardless of faith, Twining visit visit and other outstanding problems. We want to actively promote the field of multi-level governance according to lawpromote the continuous improvement of the social environment. o promote universal compliance. Actively foster the rule of law culture, carry out law publicity and education on honesty and trustworthiness, guide the masses and consciously abide by the law, failing to find method, problem-solving method, method of gradually changing the world, he is not looking for but someone %unspoken rules\ lawabide by the good atmosphere. To strengthen the comprehensive management of public security. Deepening peace xingan construction, stronglyagainst violence crime, mafia and serious criminal offences, to protect the legitimate rights and interests of citizens, legal persons, carry out criminal policy of temper justice with mercy, the maximum stimulating social vitality, and earnestly safeguard social harmony and stability. To resolve social conflicts by law. To further smooth channels of reporting social conditions and public opinion, improving regulation, arbitration, as well as dispute resolution mechanisms, implement fully the petitioners ' cases \d-party\nd supervising system of letters and calls, and to resolve the involved law lawsuit into the orbit of rule of law, vexatious, Twining visit visit, disturbing social order and other malicious extortion, resolutely crack down. Five, improving cadres Vitale, provide strong protection for forest development XI General Secretary stressed that the comprehensive revitalization in Northeast China, needs a high quality, solid style, cadres of the dare to play. Cadre cadres is a pledge, should want to do work and able to do good, enthusiasm is paramount. Treat party cadres, it is necessary to Strict management, and warm care, enable the broad masses of cadres work hard work, this is two parallel principles. In strict accordance with the standards of good cadres selection and appointment, the real officers, dare officers, those who want to play, good as excellent cadres at all levels of leadership in the past. At present, some leading cadres work initiative is not high, beyond political, idle, lazy governance governance, not as, slow, messy and a phenomenon still exist to varying degrees, affected and restricted economic and social development. We must mobilize the enthusiasm of cadres as an urgent task, adhere to combination of incentives and constraints, and adhere to the strict management and warm care, practical solution \not to\oblem, motivate cadres and better lead the masses to an undertaking, the cadres and create the new achievement in a dare to play, good at shows as new. To identify the problem, accurate pulserelationship between Government and business. The \ssions\General Secretary of \ar\d succinctly summarized the new relationship between Government and business, as pure politics, reshaping the political relationship specified in the direction. District leaders in handling political and business relations, engage in trading power for money, and finally stumbled, we a lesson, always keep in mind that \ean\cticing \o\a sincere engagement with private enterprise to help solve practical difficulties; \clarify the Division of power, exercised in accordance with, private entrepreneurs with innocent purity, not abusing power for personal gain, not to engage in trading power for money. Third, in order to maintain fairness and justice. Fairness and justice is the lifeline of the rule of law, is he best development environment. Currently, lax law enforcement and the judicial sector in our region also exist to varying degrees, lawenforcement departments and individual window units power for personal gains and bribes, thick friends, relations, human cases, money cases in which seriously infringe on the legitimate rights and interests of enterprises and people. Especially some law enforcement and inspection for profit purposes, deliberately looking for corporate loopholes, found directly under the ticket does not give business improvement opportunities. We recruit a company doesn't easily, cultivating a business more difficult, never for personal gain, systematic harassment, card, last checked to check to get the enterprise collapsed. o guarantee the legitimate rights and interests. Always proceed from the overall situation of reform and development of services, fully consider the characteristics of production and management in non-public enterprises and social benefits, an accurate grasp of legal limits, protect the enthusiasm of entrepreneurs and practitioners in innovation and entrepreneurship, enhancingexpectations and confidence. To promote strict enforcement. Strengthening law enforcement procedures, improve law enforcement performance evaluation, strengthening the supervision of law enforcement, exploration and practice of risk control mechanism of law enforcement to further standardize the social security, urban management, road traffic administrative law enforcement, effectively free, extensive law-enforcement and lax enforcement of law enforcement and other issues. o uphold justice. Justice is the last line of Defense to safeguard fairness and justice, to unequivocally support the courts and procuratorates independently exercise level ... Judicial activities were rampant, must not be allowed to run, favors, money, must not be allowed to knowingly violate the miscarriage, violations of the legitimate rights and interests of the masses must not be allowed to abuse of power, to make forest mass can be felt in every judicial cases in equity and justice. Four to deepen grass-roots governance according to law

5.2 主从触发器

主从触发器由两级触发器构成，其中一级直接接收输入信号，称为主触发器，另一级接收主触发器的输出信号，称为从触发器。两级触发器的时钟信号互补，从而有效地克服了空翻。

一．主从RS触发器 1．电路结构

Q从触发器QG1&&G2G3&&G4Q┌G9Q┌Q'主G5&触发器G7&R&Q'G611RC11SCP&G8SCP(a)(b)

图5.2.1 主从RS触发器 （a）逻辑图 （b）逻辑符号

2．工作原理

主从触发器的触发翻转分为两个节拍：

(1)当CP＝1时，CP’＝0，从触发器被封锁，保持原状态不变。这时，G7、G8打开，主触发器工作，接收R和S端的输入信号。

（2）当CP由1跃变到0时，即CP=0、CP’＝1。主触发器被封锁，输入信号R、S不再影响主触发器的状态。而这时，由于CP’＝1，G3、G4打开，从触发器接收主触发器输出端的状态。

由上分析可知，主从触发器的翻转是在CP由1变0时刻（CP下降沿）发生的，CP一旦变为0后，主触发器被封锁，其状态不再受R、S影响，故主从触发器对输入信号的敏感

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