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PIC18F2680ISPSQTP bảng dữ liệu(PDF) 239 Page - Microchip Technology |
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PIC18F2680ISPSQTP bảng dữ liệu(HTML) 239 Page - Microchip Technology |
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239 / 482 page ![]() © 2007 Microchip Technology Inc. Preliminary DS39625C-page 237 PIC18F2585/2680/4585/4680 FIGURE 18-4: ASYNCHRONOUS TRANSMISSION FIGURE 18-5: ASYNCHRONOUS TRANSMISSION (BACK TO BACK) TABLE 18-5: REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION Word 1 Word 1 Transmit Shift Reg Start bit bit 0 bit 1 bit 7/8 Write to TXREG BRG Output (Shift Clock) TX TXIF bit (Transmit Buffer Reg. Empty Flag) TRMT bit (Transmit Shift Reg. Empty Flag) 1 TCY (pin) Word 1 Stop bit Transmit Shift Reg. Write to TXREG BRG Output (Shift Clock) TX TXIF bit (Interrupt Reg. Flag) TRMT bit (Transmit Shift Reg. Empty Flag) Word 1 Word 2 Word 1 Word 2 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. 1 TCY 1 TCY (pin) Start bit Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on page INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 49 PIR1 PSPIF(1) ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 52 PIE1 PSPIE(1) ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 52 IPR1 PSPIP(1) ADIP RCIP TXIP SSPIP CCP1IP TMR2IP TMR1IP 52 RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 51 TXREG EUSART Transmit Register 51 TXSTA CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 51 BAUDCON ABDOVF RCIDL — SCKP BRG16 — WUE ABDEN 51 SPBRGH EUSART Baud Rate Generator Register High Byte 51 SPBRG EUSART Baud Rate Generator Register Low Byte 51 Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous transmission. Note 1: Reserved in PIC18F2X8X devices; always maintain these bits clear. |
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