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18F8680 Datasheet(PDF) 243 Page - Microchip Technology |
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18F8680 Datasheet(HTML) 243 Page - Microchip Technology |
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243 / 496 page  2004 Microchip Technology Inc. DS30491C-page 241 PIC18F6585/8585/6680/8680 To set up an asynchronous transmission: 1. Initialize the SPBRG register for the appropriate baud rate. If a high-speed baud rate is desired, set bit BRGH (see Section 18.1 “USART Baud Rate Generator (BRG)”). 2. Enable the asynchronous serial port by clearing bit SYNC and setting bit SPEN. 3. If interrupts are desired, set enable bit TXIE. 4. If 9-bit transmission is desired, set transmit bit TX9. Can be used as address/data bit. 5. Enable the transmission by setting bit TXEN which will also set bit TXIF. 6. If 9-bit transmission is selected, the ninth bit should be loaded in bit TX9D. 7. Load data to the TXREG register (starts transmission). If using interrupts, ensure that the GIE and PEIE bits in the INTCON register (INTCON<7:6>) are set. FIGURE 18-6: ASYNCHRONOUS RECEPTION TABLE 18-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION Start bit bit 7/8 bit 1 bit 0 bit 7/8 bit 0 Stop bit Start bit Start bit bit 7/8 Stop bit RX (pin) Reg Rcv Buffer Reg Rcv Shift Read Rcv Buffer Reg RCREG RCIF (Interrupt Flag) OERR bit CREN Word 1 RCREG Word 2 RCREG Stop bit Note: This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after the third word causing the OERR (overrun) bit to be set. 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 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u PIR1 PSPIF ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000 PIE1 PSPIE ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000 IPR1 PSPIP ADIP RCIP TXIP SSPIP CCP1IP TMR2IP TMR1IP 1111 1111 1111 1111 RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 0000 000x RCREG USART Receive Register 0000 0000 0000 0000 TXSTA CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 0000 0010 0000 0010 BAUDCON — RCIDL — SCKP BRG16 — WUE ABDEN -1-1 0-00 -1-1 0-00 SPBRGH Baud Rate Generator Register, High Byte 0000 0000 0000 0000 SPBRG Baud Rate Generator Register, Low Byte 0000 0000 0000 0000 Legend: x = unknown, – = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous reception. |
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