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PIC16F870/P Datasheet(PDF) 72 Page - Microchip Technology |
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PIC16F870/P Datasheet(HTML) 72 Page - Microchip Technology |
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72 / 156 page  PIC16F870/871 DS30569A-page 72 Preliminary © 1999 Microchip Technology Inc. FIGURE 9-7: ASYNCHRONOUS RECEPTION WITH ADDRESS DETECT FIGURE 9-8: ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST TABLE 9-7: 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 ADDEN FERR OERR RX9D 0000 000x 0000 000x 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. Start bit bit1 bit0 bit8 bit0 Stop bit Start bit bit8 Stop bit RC7/RX/DT (pin) Load RSR Read RCIF WORD 1 RCREG Bit8 = 0, Data Byte Bit8 = 1, Address Byte Note: This timing diagram shows a data byte followed by an address byte. The data byte is not read into the RCREG (receive buffer) because ADDEN = 1. Start bit bit1 bit0 bit8 bit0 Stop bit Start bit bit8 Stop bit RC7/RX/DT (pin) Load RSR Read RCIF WORD 1 RCREG Bit8 = 1, Address Byte Bit8 = 0, Data Byte Note: This timing diagram shows a data byte followed by an address byte. The data byte is not read into the RCREG (receive buffer) because ADDEN was not updated and still = 0. |
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