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PIC16F628-20/SS bảng dữ liệu(PDF) 85 Page - Microchip Technology |
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PIC16F628-20/SS bảng dữ liệu(HTML) 85 Page - Microchip Technology |
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85 / 160 page  © 1999 Microchip Technology Inc. Preliminary DS40300B-page 85 PIC16F62X Steps to follow when setting up a Synchronous Master Transmission: 1. Initialize the SPBRG register for the appropriate baud rate (Section 12.1). 2. Enable the synchronous master serial port by setting bits SYNC, SPEN, and CSRC. 3. If interrupts are desired, then set enable bit TXIE. 4. If 9-bit transmission is desired, then set bit TX9. 5. Enable the transmission by setting bit TXEN. 6. If 9-bit transmission is selected, the ninth bit should be loaded in bit TX9D. 7. Start transmission by loading data to the TXREG register. TABLE 12-2: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION FIGURE 12-12: SYNCHRONOUS TRANSMISSION FIGURE 12-13: SYNCHRONOUS TRANSMISSION (THROUGH TXEN) 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 -00x 0000 -00x 19h TXREG USART Transmit 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, read as '0'. Shaded cells are not used for Synchronous Master Transmission. Bit 0 Bit 1 Bit 7 WORD 1 Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4 Bit 2 Bit 0 Bit 1 Bit 7 RB1/RX/DT pin RB2/TX/CK pin Write to TXREG reg TXIF bit (Interrupt flag) TRMT TXEN bit ’1’ ’1’ Note: Sync master mode; SPBRG = ’0’. Continuous transmission of two 8-bit words WORD 2 TRMT bit Write word1 Write word2 RB1/RX/DT pin RB2/TX/CK pin Write to TXREG reg TXIF bit TRMT bit bit0 bit1 bit2 bit6 bit7 TXEN bit |
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