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PIC16F870/P 데이터시트(PDF) 70 Page - Microchip Technology |
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PIC16F870/P 데이터시트(HTML) 70 Page - Microchip Technology |
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70 / 156 page ![]() PIC16F870/871 DS30569A-page 70 Preliminary © 1999 Microchip Technology Inc. Steps to follow when setting up an Asynchronous Reception: 1. Initialize the SPBRG register for the appropriate baud rate. If a high speed baud rate is desired, set bit BRGH. (Section 9.1). 2. Enable the asynchronous serial port by clearing bit SYNC and setting bit SPEN. 3. If interrupts are desired, then set enable bit RCIE. 4. If 9-bit reception is desired, then set bit RX9. 5. Enable the reception by setting bit CREN. 6. Flag bit RCIF will be set when reception is com- plete and an interrupt will be generated if enable bit RCIE is set. 7. Read the RCSTA register to get the ninth bit (if enabled) and determine if any error occurred during reception. 8. Read the 8-bit received data by reading the RCREG register. 9. If any error occurred, clear the error by clearing enable bit CREN. TABLE 9-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on: POR, BOR Value on all other Resets 0Ch PIR1 PSPIF(1) ADIF RCIF TXIF — CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000 18h RCSTA SPEN RX9 SREN CREN — FERR OERR RX9D 0000 -00x 0000 -00x 1Ah RCREG USART Receive Register 0000 0000 0000 0000 8Ch PIE1 PSPIE(1) ADIE RCIE TXIE — CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000 98h TXSTA CSRC TX9 TXEN SYNC —BRGH TRMT TX9D 0000 -010 0000 -010 99h SPBRG Baud Rate Generator Register 0000 0000 0000 0000 Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for asynchronous reception. Note 1: Bits PSPIE and PSPIF are reserved on the PIC16F870; always maintain these bits clear. |
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