idle.asm

单片机汇编例程学习,大量的汇编例程

;///////////////////////////////////////////
;本程序源代码由单片机培训网提供.
;单片机培训网,让更多人学习单片机更容易.
;第一网址----www.mcuedu.com
;第二网址----http://51_train.nease.net
;创办人------刘永忠
;热线电话----[phone]
;[e-mail]
;本程序实现七段码动态显示并在个位为零时进入省电模式，
;当外中断0管脚来一个下降沿触发时，退出省电模式功能.
;///////////////////////////////////////////
			org	0000h
			ajmp	main
			org	0003h
			ajmp	int0prog
			org	0030h
main:
			mov	ie,#81h
			mov	tcon,#01h	;设置成边沿触发方式
			mov dptr,#tab
			mov 30h,#06h
			mov 31h,#07h
			mov 32h,#08h
			mov 33h,#09h
loop:
			mov r4,#25
tt1:
			lcall display
			djnz	r4,tt1
			lcall update
			jnb	10h,loop
			mov pcon,#01h
			nop
			nop
			ajmp loop			
int0prog:
			mov	pcon,#00h
			clr	10h
			nop
			reti
			
						

display:
			mov r7,#100
dd1:
			mov a,30h
			movc a,@a+dptr
			mov p0,a
			clr p2.0
			lcall delay100us
			setb p2.0

			mov a,31h
			movc a,@a+dptr
			mov p0,a
			clr p2.1
			lcall delay100us
			setb p2.1

			mov a,32h
			movc a,@a+dptr
			mov p0,a
			clr p2.2
			lcall delay100us
			setb p2.2

			mov a,33h
			movc a,@a+dptr
			mov p0,a
			clr p2.3
			lcall delay100us
			setb p2.3
			djnz r7,dd1
			ret

update:
			inc 30h
			mov a,30h
			cjne a,#10,exit
			mov 30h,#00h
			setb	10h
			inc 31h
			mov a,31h
			cjne a,#10,exit
			mov 31h,#00h
			inc 32h
			mov a,32h
			cjne a,#10,exit
			mov 32h,#00h
			inc 33h
			mov a,33h
			cjne a,#10,exit
			mov 33h,#00h
exit:
			ret

delay100us:
			mov r5,#50
			djnz	r5,$
			ret

delay10ms:
			mov r6,#100
tt2:
			mov r5,#50
			djnz r5,$
			djnz r6,tt2
			ret
			
tab:	db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h,88h,83h,0c6h,0a1h,86h,8eh

end