PIC16C63單片機(jī)串口通訊源程序

用PIC16C63A作單片機(jī)串行通信，將BUFFER1和BUFFER2中的數(shù)據(jù)通過(guò)串口發(fā)送出去.

;*******************************************
;MCU-PIC16C63A,WDT=ON,HS,16MHZ
;本例將寄存器BUFFER1和BUFFER2中的數(shù)據(jù)串口發(fā)送出去，沒(méi)有中斷調(diào)用，單片機(jī)選用PIC16C63A
;*******************************************
LIST P=PIC16C63A
INCLUDE "P16C63A.INC"
ORG 0000H
GOTO MAIN
BUFFER1 EQU 20H
BUFFER2 EQU 21H

MAIN MOVLW 0X55
MOVWF BUFFER1
MOVLW 0X56
MOVWF BUFFER2
;發(fā)送過(guò)程
BSF STATUS,RP0
MOVLW 25H
MOVWF SPBRG；設(shè)定波特率9600
CLRF TXSTA；SYNC=0-異步方式，沒(méi)有第9位，BRGH=0低速
BCF STATUS,RP0
MOVLW B'10010000'
MOVWF RCSTA；SPEN=1，串口使能
BSF TXSTA,TXEN;允許發(fā)送

MOVF BUFFER1,W;發(fā)送第一個(gè)寄存器數(shù)據(jù)
MOVWF TXREG
again BTFSS TXSTA,TRMT；判斷TSR為空則間斷
GOTO again
MOVF BUFFER2,W;發(fā)送第二個(gè)寄存器數(shù)據(jù)
MOVWF TXREG
again2 BTFSS TXSTA,TRMT;判斷TSR為空則間斷
GOTO again2
NOP
END