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PIC17C752-08/CL датащи(PDF) 170 Page - Microchip Technology |
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PIC17C752-08/CL датащи(HTML) 170 Page - Microchip Technology |
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170 / 328 page ![]() PIC17C7XX DS30289A-page 170 © 1998 Microchip Technology Inc. FIGURE 15-39: BUS COLLISION DURING START CONDITION (SCL = 0) FIGURE 15-40: BRG RESET DUE TO SDA COLLISION DURING START CONDITION SDA SCL SEN Bus collision occurs, Set BCLIF. SCL = 0 before SDA = 0, Set SEN, enable start sequence if SDA = 1, SCL = 1 T BRG T BRG SDA = 0, SCL = 1 BCLIF S SSPIF Interrupts cleared in software. Bus collision occurs, Set BCLIF. SCL = 0 before BRG time out, '0' '0' '0' '0' SDA SCL SEN Set S Set SEN, enable start sequence if SDA = 1, SCL = 1 Less than T BRG T BRG SDA = 0, SCL = 1 BCLIF S SSPIF S Interrupts cleared in software. Set SSPIF SDA = 0, SCL = 1 SDA pulled low by other master. Reset BRG and assert SDA SCL pulled low after BRG Timeout Set SSPIF '0' |
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