參數(shù)資料
型號: UPD1724x
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS
中文描述: 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì)
文件頁數(shù): 43/102頁
文件大小: 461K
代理商: UPD1724X
43
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
(2) Port 1A
Whether a resistor is connected to each bit of port P1A when a key matrix is not used can be specified in 1-
bit units by using the following register file
Note
.
To connect a resistor, select whether a pull-down or pull-up resistor is to be connected, by using P1AHL
(address 05H) of the register file.
P1ABPU0
0
1
0
P1ABPU0
Address
RF: 07H
After reset
0H
R/W
R/W
1
P1ABPU1
2
P1ABPU2
3
0
Connects resistor to P1A
0
P1ABPU1
0
1
Connects resistor to P1A
1
P1ABPU2
0
1
Connects resistor to P1A
2
Not connected
Connected
Not connected
Connected
Not connected
Connected
Note
To disconnect the resistor in the output mode, clear the corresponding bit of the P1ABPU register.
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