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參數(shù)資料
| 型號(hào)： | μPD789830 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8 位微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位微控制器） |
| 文件頁(yè)數(shù)： | 85/211頁(yè) |
| 文件大?。?/td> | 1262K |
| 代理商： | ΜPD789830 |
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CHAPTER 4 PORT FUNCTIONS
85
4.4 Operation of Port Functions
The operation of a port differs depending on whether the port is set in 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 of a port by using a transfer instruction. The contents of the
output latch can be output from the pins of the port.
The data once written to the output latch 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.
The data once written to the output latch 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 an input/output port, therefore, the contents of the output
latch of the pin that is set in input mode and not subject to manipulation become
undefined.
4.4.2 Reading from I/O port
(1)
In output mode
The contents of the 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 with the contents of the 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.
The data once written to the output latch 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 an input/output port, therefore, the contents of the output
latch of the pin that is set in input mode and not subject to manipulation become
undefined.
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相關(guān)代理商/技術(shù)參數(shù) |
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| PD78F0134 | 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers |
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| PD78F0134(A1) | 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers |
| PD78F0134A | 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers |
| PD78F0134A1 | 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers |
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