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PIC16F87 Datasheet(PDF) 103 Page - Microchip Technology |
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PIC16F87 Datasheet(HTML) 103 Page - Microchip Technology |
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103 / 230 page  2002-2013 Microchip Technology Inc. DS30487D-page 103 PIC16F87/88 When setting up an asynchronous transmission, follow these steps: 1. Initialize the SPBRG register for the appropriate baud rate. If a high-speed baud rate is desired, set bit BRGH (Section 11.1 “AUSART Baud Rate Generator (BRG)”). 2. Enable the asynchronous serial port by clearing bit SYNC and setting bit SPEN. 3. If interrupts are desired, then set enable bit TXIE. 4. If 9-bit transmission is desired, then set transmit bit TX9. 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). 8. If using interrupts, ensure that GIE and PEIE (bits 7 and 6) of the INTCON register are set. FIGURE 11-2: ASYNCHRONOUS MASTER TRANSMISSION FIGURE 11-3: ASYNCHRONOUS MASTER TRANSMISSION (BACK TO BACK) TABLE 11-7: REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION 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 0Bh, 8Bh, 10Bh,18Bh INTCON GIE PEIE TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u 0Ch PIR1 — ADIF(1) RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF -000 0000 -000 0000 18h RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 0000 000x 19h TXREG AUSART Transmit Data Register 0000 0000 0000 0000 8Ch PIE1 — ADIE(1) RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE -000 0000 -000 0000 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 transmission. Note 1: This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87. Word 1 Stop Bit Word 1 Transmit Shift Reg Start Bit Bit 0 Bit 1 Bit 7/8 Write to TXREG BRG Output (Shift Clock) RB5/SS/TX/CK pin TXIF bit (Transmit Buffer Reg. Empty Flag) TRMT bit (Transmit Shift Reg. Empty Flag) Word 1 Transmit Shift Reg. Write to TXREG BRG Output (Shift Clock) RB5/SS/TX/CK pin TXIF bit (Interrupt Reg. Flag) TRMT bit (Transmit Shift Reg. Empty Flag) Word 1 Word 2 Word 1 Word 2 Start Bit Stop Bit Start Bit Transmit Shift Reg. Word 1 Word 2 Bit 0 Bit 1 Bit 7/8 Bit 0 Note: This timing diagram shows two consecutive transmissions. |
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