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PICDEM2 Datasheet(PDF) 27 Page - Microchip Technology |
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PICDEM2 Datasheet(HTML) 27 Page - Microchip Technology |
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27 / 60 page  PICDEM 2 User’s Guide DS30374D-page 22 2001 Microchip Technology Inc. 5.1.3 TX and RX Routines The TX and RX routines transmit and receive 8 data bits, respectively. Data is transmitted/received one bit at a time by left bit-shifting the transmit/receive buffer. A counter, set initially to 8, is decremented until all 8 bits of data are sent/received. Finally, acknowledgment bits are received/transmitted. In the case of transmission, if an acknowledgment is not received, an error flag is set. Figure 5.8: Transmit Set counter for eight bits (BITOUT) Send Bit (BITIN) Rotate transmit buffer left Read acknowledge bit Return Default bit out = 0 If shifted bit = 0, data bit = 0 else data bit = 1 8 bits transmitted? No Yes Acknowledgment Yes ERR Received? No |
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