參數(shù)資料
型號(hào)： UPD17225MC
廠商： NEC Corp.
元件分類(lèi)： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁(yè)數(shù)： 25/84頁(yè)
文件大?。?/td> 393K
代理商： UPD17225MC
μ
PD17225, 17226, 17227, 17228
25
Data Sheet U12643EJ2V0DS00
3.
PORTS
3.1
Port 0A (P0A
0
-P0A
3
)
This is a 4-bit input port. Data is read through port register P0A (address 70H). This port is a CMOS input port with
a pull-up resistor, and can be used for key return input for a key matrix.
When a low-level signal is input to at least one of the pins in this port in the standby mode, the standby mode is released.
3.2
Port 0B (P0B
0
-P0B
3
)
This is a 4-bit input port. Data is read through port register P0B (address 71H). This port is a CMOS input port with
a pull-up resistor, and can be used for key return input for a key matrix.
When a low-level signal is input to at least one of the pins in this port in the standby mode, the standby mode is released.
3.3
Port 0C (P0C
0
-P0C
3
)
This is a 4-bit output port. The contents of the output latch are read and output data is set through port register P0C
(address 72H). This port is an N-ch open-drain output port, and can be used as the key source of a key matrix.
In the standby mode, this port outputs low-level signals.
3.4
Port 0D (P0D
0
-P0D
3
)
This is a 4-bit output port. The contents of the output latch are read and output data is set through port register P0D
(address 73H). This port is an N-ch open-drain output port, and can be used as the key source for a key matrix.
In the standby mode, this port outputs low-level signals.
3.5
Port 0E (P0E
0
-P0E
3
)
This is a 4-bit I/O port which can be set in either the input or output mode in 1-bit units by the P0EBIO (address 27H)
of the register file.
To read the input data or to set the output data, use the P0E register (address 6F). When data is read in the output
mode, the contents of the output latch are read.
Connection of a pull-up resistor can be specified in 1-bit units by the P0EBPU (address 17H) of the register file. (When
the pull-up resistor is connected, note that the pull-up resistor is not disconnected even when the output mode is set.)
On reset, this port functions as an input port.
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