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PIC12F1822-I/MF датащи(PDF) 269 Page - Microchip Technology |
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PIC12F1822-I/MF датащи(HTML) 269 Page - Microchip Technology |
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269 / 398 page ![]() 2010 Microchip Technology Inc. Preliminary DS41413A-page 269 PIC12F/LF1822/16F/LF1823 FIGURE 24-34: BUS COLLISION DURING START CONDITION (SCL = 0) FIGURE 24-35: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION SDA SCL SEN bus collision occurs. Set BCL1IF. SCL = 0 before SDA = 0, Set SEN, enable Start sequence if SDA = 1, SCL = 1 TBRG TBRG SDA = 0, SCL = 1 BCL1IF S SSP1IF Interrupt cleared by software bus collision occurs. Set BCL1IF. SCL = 0 before BRG time-out, ’0’’0’ ’0’ ’0’ SDA SCL SEN Set S Less than TBRG TBRG SDA = 0, SCL = 1 BCL1IF S SSP1IF S Interrupts cleared by software set SSP1IF SDA = 0, SCL = 1, SCL pulled low after BRG time-out Set SSP1IF ’0’ SDA pulled low by other master. Reset BRG and assert SDA. Set SEN, enable Start sequence if SDA = 1, SCL = 1 |
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