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參數(shù)資料
| 型號(hào)： | UPD789022GB-XXX-8ES-A |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, LQFP-44 |
| 文件頁(yè)數(shù)： | 198/221頁(yè) |
| 文件大?。?/td> | 1619K |
| 代理商： | UPD789022GB-XXX-8ES-A |
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CHAPTER 4 PORT FUNCTIONS
User’s Manual U11919EJ4V0UD
78
4.4 Operation of Port Functions
The operation of a port differs depending on whether the port is set in the input or output mode, as described
below.
4.4.1 Writing to I/O port
(1)
In output mode
A value can be written to the output latch by using a transfer instruction. The contents of the output latch
can be output from the pins of the port.
Once data is written to the output latch, it is retained until new data is written to the output latch.
(2)
In input mode
A value can be written to the output latch by using a transfer instruction. However, the status of the port pin
is not changed because the output buffer is OFF.
Once data is written to the output latch, it is retained until new data is written to the output latch.
Caution
A 1-bit memory manipulation instruction is executed to manipulate 1 bit of a port.
However, this instruction accesses the port in 8-bit units.
When this instruction is
executed to manipulate a bit of a port consisting both of inputs and outputs, therefore, the
contents of the output latch of the pin that is set in the input mode and not subject to
manipulation become undefined.
4.4.2 Reading from I/O port
(1)
In output mode
The contents of an output latch can be read by using a transfer instruction. The contents of the output latch
are not changed.
(2)
In input mode
The status of a pin can be read by using a transfer instruction. The contents of the output latch are not
changed.
4.4.3 Arithmetic operation of I/O port
(1)
In output mode
An arithmetic operation can be performed on the contents of an output latch. The result of the operation is
written to the output latch. The contents of the output latch are output from the port pins.
Once data is written to the output latch, it is retained until new data is written to the output latch.
(2)
In input mode
The contents of the output latch become undefined. However, the status of the pin is not changed because
the output buffer is OFF.
Caution
A 1-bit memory manipulation instruction is executed to manipulate 1 bit of a port.
However, this instruction accesses the port in 8-bit units.
When this instruction is
executed to manipulate a bit of a port consisting both of inputs and outputs, therefore, the
contents of the output latch of the pin that is set in the input mode and not subject to
manipulation become undefined.
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