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PIC 16F877 and Serial communication

PIC 16F877 and Serial communication. Serial communication. movlw d’129’ ; 9600 @20Mhz movwf SPBRG. movlw b'00100100' ; brgh = 1 movwf TXSTA ; enable Async Transmission, set brgh banksel RCSTA ; bank0 movlw b'10010000' movwf RCSTA ; enable Async Reception. RecLoop nop

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PIC 16F877 and Serial communication

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  1. PIC 16F877 and Serial communication Serial communication

  2. movlw d’129’ ; 9600 @20Mhz movwf SPBRG movlw b'00100100' ; brgh = 1 movwf TXSTA ; enable Async Transmission, set brgh banksel RCSTA ; bank0 movlw b'10010000' movwf RCSTA ; enable Async Reception

  3. RecLoop nop btfss PIR1,RCIF ; check for received data goto RecLoop movf RCREG,w return TxLoop nop btfss PIR1,TXIF ;xmit buffer empty? goto TxLoop ;no, wait movwf TXREG return Reception and transmit loops

  4. PIC and PC Serial port

  5. Table 5 : Table of Registers

  6. LSR register

  7. Subroutine for reading and Writing Reading int c; int PORT1=0x2F8; c = inp(PORT1 + 5); If (c & 1==1) { myvalue = inp(PORT1); } …… Writing: c = inp(PORT1 + 5); If (((c&0x20)>>5)==1) {outp(PORT1,value)};

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