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PIC16F-E/P 数据表(PDF) 81 Page - Microchip Technology |
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PIC16F-E/P 数据表(HTML) 81 Page - Microchip Technology |
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81 / 178 page  © 2007 Microchip Technology Inc. DS40044F-page 79 PIC16F627A/628A/648A FIGURE 12-3: ASYNCHRONOUS TRANSMISSION (BACK TO BACK) TABLE 12-6: 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 Value on all other Resets 0Ch PIR1 EEIF CMIF RCIF TXIF — CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000 18h RCSTA SPEN RX9 SREN CREN ADEN FERR OERR RX9D 0000 000x 0000 000x 19h TXREG USART Transmit Data Register 0000 0000 0000 0000 8Ch PIE1 EEIE CMIE 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 Transmission. Transmit Shift Reg. Write to TXREG BRG output (shift clock) RB2/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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