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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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INTEDG датащи(PDF) 288 Page - Microchip Technology |
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INTEDG датащи(HTML) 288 Page - Microchip Technology |
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288 / 478 page  PIC16(L)F1946/47 DS41414D-page 288 2010-2012 Microchip Technology Inc. 24.6.13.3 Bus Collision During a Stop Condition Bus collision occurs during a Stop condition if: a) After the SDAx pin has been deasserted and allowed to float high, SDAx is sampled low after the BRG has timed out. b) After the SCLx pin is deasserted, SCLx is sampled low before SDAx goes high. The Stop condition begins with SDAx asserted low. When SDAx is sampled low, the SCLx pin is allowed to float. When the pin is sampled high (clock arbitration), the Baud Rate Generator is loaded with SSPxADD and counts down to 0. After the BRG times out, SDAx is sampled. If SDAx is sampled low, a bus collision has occurred. This is due to another master attempting to drive a data ‘0’ (Figure 24-37). If the SCLx pin is sampled low before SDAx is allowed to float high, a bus collision occurs. This is another case of another master attempting to drive a data ‘0’ (Figure 24-38). FIGURE 24-38: BUS COLLISION DURING A STOP CONDITION (CASE 1) FIGURE 24-39: BUS COLLISION DURING A STOP CONDITION (CASE 2) SDAx SCLx BCLxIF PEN P SSPxIF TBRG TBRG TBRG SDAx asserted low SDAx sampled low after TBRG, set BCLxIF ’0’ ’0’ SDAx SCLx BCLxIF PEN P SSPxIF TBRG TBRG TBRG Assert SDAx SCLx goes low before SDAx goes high, set BCLxIF ’0’ ’0’ |
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