代码

#include<p16f877.inc>

	cblock	0x20
txBuff	:8
txPtr
txCount
	endc

chkSum 	equ 	0x30

	org 0x000
	goto main
	
	org 0x020
main
	call Send_Data
	goto $

Send_Data
	clrf	STATUS
	MOVF	txCount,w
	skpz
	return
	
	clrf 	chkSum
	movlw	txBuff
	movwf	FSR
	MOVLW	'1'
	CALL	AddData
	MOVLW	'2'
	CALL	AddData	
	MOVLW	'3'
	CALL	AddData
	MOVLW	'4'
	CALL	AddData
	MOVLW	0x0d
	CALL	AddData
	MOVLW	0x0a
	CALL	AddData
	movf	chkSum,w
	return

AddData
	addwf	chkSum,f
	movwf	INDF
	INCF	FSR,f
	incf	txCount,f
	return
	
end
		

仿真效果图

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