upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 43

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

(2) Port 1A
Note
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
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.
3
0
To disconnect the resistor in the output mode, clear the corresponding bit of the P1ABPU register.
P1ABPU2
2
P1ABPU1
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
1
P1ABPU0
0
Data Sheet U15002EJ1V1DS
P1ABPU0
P1ABPU1
P1ABPU2
Note
Address
RF: 07H
0
1
0
1
0
1
.
Not connected
Connected
Not connected
Connected
Not connected
Connected
After reset
0H
Connects resistor to P1A
Connects resistor to P1A
Connects resistor to P1A
R/W
R/W
0
1
2
43