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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC17C752-08/CL датащи(PDF) 172 Page - Microchip Technology |
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PIC17C752-08/CL датащи(HTML) 172 Page - Microchip Technology |
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172 / 328 page  PIC17C7XX DS30289A-page 172 © 1998 Microchip Technology Inc. 15.2.18.3 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 allow 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 another case of another master attempting to drive a data '0'. (Figure 15-43) FIGURE 15-43: BUS COLLISION DURING A STOP CONDITION (CASE 1) FIGURE 15-44: 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' '0' '0' |
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