upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 79
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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4.4 Port Function Operations
4.4.1 Writing to I/O port
(1) Output mode
(2) Input mode
4.4.2 Reading from I/O port
(1) Output mode
(2) Input mode
4.4.3 Operations on I/O port
(1) Output mode
(2) Input mode
Port operations differ depending on whether the input or output mode is set, as shown below.
Caution In the case of 1-bit memory manipulation instruction, although a single bit is manipulated, the
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.
The data of the output latch is cleared when a reset signal is generated.
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.
The data of the output latch is cleared when a reset signal is generated.
The output latch contents are read by a transfer instruction. The output latch contents do not change.
The pin status is read by a transfer instruction. The output latch contents do not change.
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.
The data of the output latch is cleared when a reset signal is generated.
The pin level is read and an operation is performed on its contents. The result of the operation is written to the
output latch, but since the output buffer is off, the pin status does not change.
The data of the output latch is cleared when a reset signal is generated.
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.
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 4 PORT FUNCTIONS
79
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