buzzer49.asm

单片机的应用及其原理

;----------------------------------------------------------------------
;file name:buzzer.asm
;目的：说明HT49R50蜂鸣器的使用
;硬件连接:将蜂鸣器连接至引脚PA.0和PA.1处
;;;
;-----
include ht49c50.inc
code	.section	at 0h 'code'
org	00h
jmp start
;----------------------
data	.section	'data'
	count1	db	?
	count2	db	?
;----------------------
main	.section	'code'
org	20h
start:
	set 	pa.0
	set		pa.1
	call	delay
	clr		pa.1
	clr 	pa.0
	call	delay
	call	delay
	set		pa.0
	set		pa.1
	call	delay
	call 	delay
	clr		pa.0
	call	delay
	call	delay
	jmp		start
delay	proc
	mov 	a,0ffh
	mov		count1,a
	mov 	a,0ffh
	mov 	count2,a
loop1:	
	sdz		count1
	jmp		loop1
    sdz 	count2
	jmp		loop1
	ret
delay	endp
end