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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC876 датащи(PDF) 95 Page - Microchip Technology |
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PIC876 датащи(HTML) 95 Page - Microchip Technology |
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95 / 218 page  2001 Microchip Technology Inc. DS30292C-page 93 PIC16F87X 9.2.18.3 Bus Collision During a STOP Condition Bus collision occurs during a STOP condition if: a) After the SDA pin has been de-asserted and allowed to float high, SDA is sampled low after the BRG has timed out. b) After the SCL pin is de-asserted, SCL is sam- pled low before SDA goes high. The STOP condition begins with SDA asserted low. When SDA is sampled low, the SCL pin is allowed to float. When the pin is sampled high (clock arbitration), the baud rate generator is loaded with SSPADD<6:0> and counts down to 0. After the BRG times out, SDA is sampled. If SDA is sampled low, a bus collision has occurred. This is due to another master attempting to drive a data ’0’. If the SCL pin is sampled low before SDA is allowed to float high, a bus collision occurs. This is a case of another master attempting to drive a data ’0’ (Figure 9-25). FIGURE 9-25: BUS COLLISION DURING A STOP CONDITION (CASE 1) FIGURE 9-26: BUS COLLISION DURING A STOP CONDITION (CASE 2) SDA SCL BCLIF PEN P SSPIF TBRG TBRG TBRG SDA asserted low SDA sampled low after TBRG, Set BCLIF ’0’ ’0’ ’0’ ’0’ SDA SCL BCLIF PEN P SSPIF TBRG TBRG TBRG Assert SDA SCL goes low before SDA goes high, Set BCLIF ’0’ ’0’ |
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