EM78P159N
R-Option功能的应用
义隆电子股份有限公司
第一版 2009年06月
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EM78P159N
R-option功能的应用
目 录
一、 相关寄存器...............................................................................................................2
1、IOCE（WDT控制寄存器）..............................................................................................2
二、 使用步骤...................................................................................................................2 三、 使用举例...................................................................................................................2
EM78P159N应用笔记
? 1
EM78P159N
R-option功能的应用
EM78P159N R-option功能的使用
一、 相关寄存器
1、 IOCE（WDT控制寄存器）
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WDTE EIS - ROC PSWE PSW2 PSW1 PSW0
Bit 4(ROC)：ROC位用于R-option功能
1：使能R-option功能 0：禁止R-option功能
二、 使用步骤
1、 P5.0、P5.1需外接小于430K的下拉电阻 2、 使能R-option功能
三、 使用举例
;***************************************** ;根据P5.0、P5.1输入状态点亮不同的LED ;***************************************** ;MCU:EM78P159N ;Oscillator: IRC 4MHz ;Clock: 2 ;CYES:2cycle ;WDT: Disable
;编译软件: WicePulse version 2.7081231
INCLUDE \ REG
2 ?
== 0x10 ;保存P5.0、P5.1状态寄存器
ORG JMP ORG
0x00 INITIAL 0x50
EM78P159N应用笔记 INITIAL:
EM78P159N
R-option功能的应用
CLRA MOV IOW MOV IOW MOV IOW
PORT6,A IOC6
;PORT6输出低 ;PORT6设为输出
A,@0XFF IOC5
;PORT5设为输入
A,@0B00011111 IOCE
;启用R-option功能
MAIN:
MOV XOR JBC JMP JMP
A, REG A, @0x02 Z
;判断是否满足条件3,满足则跳到分支程序3 ;不满足条件3则继续判断
MOV XOR JBC JMP
A, REG A, @0x01 Z
;判断是否满足条件2,满足则跳到分支程序2 ;不满足条件2则继续判断
MOV AND MOV MOV IOW MOV IOW
A,PORT5
;读出PORT5以取得P5.0、P5.1的R-option引脚状态
A,@0B00000011 REG,A
;保存P5.0、P5.1电平状态
A,@0B00000000 IOCE
;禁止R-option功能
A,@0B00000000 IOC5
;P5.0、P5.1设为输出
;后PORT5可做为普通I/O口使用分支检测程序
MOV JBC
A, REG Z
;判断是否满足条件1,满足则跳到分支程序1 ;不满足条件1则继续判断
JMP Case1
Case2
Case3 Case4
;除以上三种条件外,则跳至分支程序4
;用户程序1
CASE1:
BS
PORT6,1
? 3
EM78P159N应用笔记
EM78P159N R-option功能的应用
