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PIC16F877AI/ML 数据表(PDF) 109 Page - Microchip Technology |
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PIC16F877AI/ML 数据表(HTML) 109 Page - Microchip Technology |
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109 / 234 page  2003 Microchip Technology Inc. DS39582B-page 107 PIC16F87XA FIGURE 9-27: BUS COLLISION DURING START CONDITION (SCL = 0) FIGURE 9-28: BRG RESET DUE TO SDA ARBITRATION 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 Interrupt cleared in software bus collision occurs. Set BCLIF. SCL = 0 before BRG time-out, ‘0’‘0’ ‘0’ ‘0’ SDA SCL SEN Set S Less than TBRG TBRG SDA = 0, SCL = 1 BCLIF S SSPIF S Interrupts cleared in software set SSPIF SDA = 0, SCL = 1, SCL pulled low after BRG time-out Set SSPIF ‘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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