《增强型8051单片机实用开发技术》例程代码

				A51 MACRO ASSEMBLER  EX7_7                                                                11/27/2009 21:53:52 PAGE     1
				
				
				MACRO ASSEMBLER A51 V8.01
				OBJECT MODULE PLACED IN ex7-7.OBJ
				ASSEMBLER INVOKED BY: C:\Keil\C51\BIN\A51.EXE ex7-7.asm SET(SMALL) DEBUG EP
				
				LOC  OBJ            LINE     SOURCE
				
				                       1     ;$include (STC12C5A.INC) ;包含STC12C5A60S2寄存器定义文件
				                +1     2     $nomod51 
				                +1     3  +1 $save 
				                +1   152  +1 $restore 
				  0028               153     CCAPnL_Value  EQU  28H    ;fosc=20MHz时,高速脉冲输出= 125KHz
				0000                 154             ORG   0000H 
				0000 020060          155             LJMP  MAIN
				003B                 156             ORG   003BH              ;PCA中断入口地址
				003B 020084          157             LJMP  PCA_ISR
				0060                 158             ORG   0060H 
				0060                 159     MAIN:
				0060 758170          160         MOV   SP, #70H           ;设置堆栈指针 
				                     161             ;PCA模块初始化
				0063 75D902          162             MOV   CMOD, #00000010B   ;CIDL = 0,PCA 计势髟诳障心Ｊ较录绦