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PIC16F877 Datasheet(PDF) 93 Page - Microchip Technology |
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PIC16F877 Datasheet(HTML) 93 Page - Microchip Technology |
93 / 218 page 2001 Microchip Technology Inc. DS30292C-page 91 PIC16F87X FIGURE 9-21: BUS COLLISION DURING START CONDITION (SCL = 0) FIGURE 9-22: 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 TBRG TBRG 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 TBRG TBRG 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 Time-out Set SSPIF ’0’ |
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