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CHAPTER 6 PORT FUNCTIONS
152
6.4 Port Function Operations
Port operations differ depending on whether the input or output mode is set, as shown below.
6.4.1 Writing to input/output port
(1) Output mode
A value is written to the output latch by a transfer instruction, and the output latch contents are output from the
pin.
Once data is written to the output latch, it is retained until data is written to the output latch again.
(2) Input mode
A value is written to the output latch by a transfer instruction, but since the output buffer is OFF, the pin status
does not change.
Once data is written to the output latch, it is retained until data is written to the output latch again.
Caution In the case of 1-bit memory manipulation instruction, although a single bit is manipulated, 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 also undefined in addition to the
manipulated bit.
6.4.2 Reading from input/output port
(1) Output mode
The output latch contents are read by a transfer instruction. The output latch contents do not change.
(2) Input mode
The pin status is read by a transfer instruction. The output latch contents do not change.
Содержание 78014Y Series
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