不好意思我有一个问题测试不出来 就是利用PIC16F687的USART来传送资料 123,97,45,48,125是我要传送的值, 虽然用试波器测试,有波型出现 可是用终端机接到电脑上值测试是否是我想要的 发现跟我所传输的值不太一样 那也跟改了 BAUDCTL 的设定值试看看,结果还是跟传送的不符 那我想再请教各位前辈一下,为什麽会不一样 因为这是我的第一份程式,我想把他给弄懂 希望前辈们能帮助我一下, 谢谢 程式如下: list p=16f687 #include <P16F687.inc> ; Macros SelBank0 macro BCF STATUS,RP1 BCF STATUS,RP0 endm SelBank1 macro BCF STATUS,RP1 BSF STATUS,RP0 endm SelBank2 macro BSF STATUS,RP1 BCF STATUS,RP0 endm SelBank3 macro BSF STATUS,RP1 BSF STATUS,RP0 endm ORG 0X00 GOTO MAIN MAIN CALL INITIAL USART_TX MOVLW .123 SelBank0 MOVWF TXREG USART_TX_0 CLRWDT BTFSS PIR1,TXIF ;判断TRANSMIT BUFFER是否满了 GOTO USART_TX_0 SelBank0 CLRF TXREG ;MOVF TXDATA1,W MOVLW .97 MOVWF TXREG USART_TX_1 CLRWDT BTFSS PIR1,TXIF ;判断TRANSMIT BUFFER是否满了 GOTO USART_TX_1 SelBank0 CLRF TXREG ;MOVLW B'00101100' ;SelBank0 ;MOVWF TXREG USART_TX_1_0 CLRWDT BTFSS PIR1,TXIF ;判断TRANSMIT BUFFER是否满了 GOTO USART_TX_1_0 SelBank0 CLRF TXREG ;MOVF TXDATA2,W MOVLW .45 SelBank0 MOVWF TXREG USART_TX_2 CLRWDT BTFSS PIR1,TXIF ;判断TRANSMIT BUFFER是否满了 GOTO USART_TX_2 SelBank0 CLRF TXREG MOVLW .48 ;MOVF TXDATA3,W MOVWF TXREG USART_TX_3 CLRWDT BTFSS PIR1,TXIF ;判断TRANSMIT BUFFER是否满了 GOTO USART_TX_3 SelBank0 CLRF TXREG MOVLW .125 ;MOVF TXDATA4,W SelBank0 MOVWF TXREG GOTO USART_TX INITIAL SelBank1 MOVLW B'00001111' ;#B'00001111' MOVWF OPTION_REG ;ENABLE PORTA/B PULL-UP,INT-FALLING,WDT,WDT RATE 1:128 BANKSEL WDTCON MOVLW B'00001001' ;#B'00001001' MOVWF WDTCON ;WDT 1:512,WDT IS ON BIT0=1;SLEEP SET BIT0=0 BANKSEL OSCCON MOVLW B'01100101' ;#B'01100101' MOVWF OSCCON ;INTERNAL OSC 4MHz ;;;;;PORTA SelBank0 BANKSEL PORTA MOVLW B'00000100' ;#B'00000100' MOVWF PORTA BANKSEL TRISA MOVLW B'00000100' ;#B'00000100' MOVWF TRISA BANKSEL WPUA MOVLW B'00000100' ;#B'00000100' MOVWF WPUA BANKSEL IOCA MOVLW B'00000000' ;#B'00000000' MOVWF IOCA ;;;;;PORTB BANKSEL PORTB MOVLW B'00000000' ;#B'00000000' MOVWF PORTB BANKSEL TRISB MOVLW B'00100000' ;#B'00100000' MOVWF TRISB BANKSEL WPUB MOVLW B'00000000' ;#B'00000000' MOVWF WPUB BANKSEL IOCB MOVLW B'00000000' ;#B'00000000' MOVWF IOCB ;;;;;PORTC BANKSEL PORTC MOVLW B'00000000' ;#B'00000000' MOVWF PORTC BANKSEL TRISC MOVLW B'00001111' ;#B'00001111' MOVWF TRISC ;;;;;INTERRUPT SelBank0 MOVLW B'00000000' ;DISABLE GIE,INTE,RABIE MOVWF INTCON ;;;;;USART SelBank1 MOVLW B'00100100' ;8-BIT TRANSMISSION,TRANSMIT ENABLED,ASYNCHRONOUS MODE,HIGH SPEED,TSR EMPTY MOVWF TXSTA SelBank0 MOVLW B'10010000' ;SERIAL PORT ENABLED,8-BIT RECEPTION,ENABLES CONTINUOUS RECEIVE,DISABLES ADDRESS DETECTION,NO FRAMING ERROR,NO OVERRUN ERROR MOVWF RCSTA SelBank1 MOVLW .25 ;SET BAUD RATES AT 9600K WITH HIGH SPEED MODE(4MHZ=25,20MHZ=129) MOVWF SPBRG SelBank1 BSF PIE1,TXIE ;ENABLES THE USART TRANSMIT INTERRUPT ;开启USART BSF PIE1,RCIE ;ENABLES THE USART RECEIVE INTERRUPT ;开启USART SelBank0 BCF PIR1,TXIF ;THE USART TRANSMIT BUFFER IS FULL BCF PIR1,RCIF ;THE USART RECEIVE BUFFER IS EMPTY SelBank1 MOVLW B'01001001' MOVWF BAUDCTL RETURN END --

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