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UPD78044F Datasheet(PDF) 101 Page - NEC |
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UPD78044F Datasheet(HTML) 101 Page - NEC |
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101 / 472 page  101 Chapter 4 Port Functions User’s Manual U16504EE1V1UD00 4.4.3 Operations on input/output port (1) Output mode An operation is performed on the output latch contents, and the result is written to the output latch. The output latch contents are output from the pins. Once data is written to the output latch, it is retained until data is written to the output latch again. (2) Input mode The output latch contents are undefined, but since the output buffer is OFF, the pin status does not change. Caution: In the case of 1-bit memory manipulation instruction, although a single bit is manipu- lated the port is accessed as an 8-bit unit. Therefore, on a port with a mixture of input and output pins, the output latch contents for pins specified as input are undefined, even for bits other than the manipulated bit. |
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