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LED 的代码
led.lst
A51 MACRO ASSEMBLER LED 09/16/2006 13:30:22 PAGE 1
MACRO ASSEMBLER A51 V6.12
OBJECT MODULE PLACED IN .\led.OBJ
ASSEMBLER IN
led.c
//串行驱动led显示，
//一个74hc595位移寄存器驱动三极管驱动led位，
//两个74hc595驱动led段，方式位5位x8段x2=10个数码管
//5分频，每次扫描时间位1.25ms
//定义特殊符号
#define nul 0xf
#define qc 0xc
#define qb 0xb
#define q_ 0xa
#define q__ 0xd
led.lst
ASEM-51 V1.2 Copyright (c) 1996 by W.W. Heinz PAGE 1
MCS-51 Family Cross Assembler A S E M - 5 1
led.sdi
,,,light bit 00h
,,, org 0
0000,02 00 30,, ljmp start
,,, org 3
0003,B2 00,, cpl light
0005,32,, reti
,,, org 30h;这句不明白是什么意思
0
led.asm
light bit 00h
org 0
ljmp start
org 3
cpl light
reti
org 30h;这句不明白是什么意思
start: setb it0
setb ex0
setb ea
mov a,#0FEH
setb light
loop: jnb light,loop
mov p1,a
lcall delay
rl