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18F8680 Datasheet(PDF) 240 Page - Microchip Technology |
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18F8680 Datasheet(HTML) 240 Page - Microchip Technology |
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240 / 496 page  PIC18F6585/8585/6680/8680 DS30491C-page 238 2004 Microchip Technology Inc. FIGURE 18-2: USART TRANSMIT BLOCK DIAGRAM FIGURE 18-3: ASYNCHRONOUS TRANSMISSION FIGURE 18-4: ASYNCHRONOUS TRANSMISSION (BACK TO BACK) TXIF TXIE Interrupt TXEN Baud Rate CLK SPBRG Baud Rate Generator TX9D MSb LSb Data Bus TXREG Register TSR Register (8) 0 TX9 TRMT SPEN RC6/TX/CK pin Pin Buffer and Control 8 • • • SPBRGH BRG16 Word 1 Word 1 Transmit Shift Reg Start bit bit 0 bit 1 bit 7/8 Write to TXREG Word 1 BRG Output (Shift Clock) RC6/TX/CK TXIF bit (Transmit Buffer Reg. Empty Flag) TRMT bit (Transmit Shift Reg. Empty Flag) 1 TCY (pin) Stop bit Transmit Shift Reg. Write to TXREG BRG Output (Shift Clock) RC6/TX/CK 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 |
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