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UPD6708 数据表(PDF) 57 Page - NEC |
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UPD6708 数据表(HTML) 57 Page - NEC |
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57 / 72 page  57 µPD6708 8.3.3 Master transmission processing routine This processing routine is used when a unit becomes the master unit after executing the MREQ1 or MREQ2 command and transmits data and commands to a slave unit. This routine is an interrupt service routine, and is executed when the return code (higher 2 bits = 00) is read in master transmission. Notes 1. To transmit the remaining data, execute the MREQ2 command (see 8.3.2 (3)). To abort master transmission, execute the ABORT command (see 8.3.2 (6)). 2. N1: Number of master transmit data bytes. Start Read STR Return code 3H? N1 = 0 Normal end N Y Set master transmit data. WDB full? Write to WDB N Note 2 Return code 2H? Y N Y Note 1 Termination during transmission N1 ← N1 – 1 Note 2 N Y |
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