UPD61P34BGS NEC, UPD61P34BGS Datasheet - Page 9

• Manufacturer Part Number: UPD61P34BGS
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

1.4 Dealing with Unused Pins
1.5 Notes on Using K
released (when RESET pin changes from low level to high level, or POC is released due to supply voltage startup).
The following connections are recommended for unused pins in the normal operation mode.
Note If the circuit is an applied one requiring high reliability, be sure to design it in such a manner that the RESET
Caution The I/O mode and the terminal output level are recommended to be fixed by setting them
In order to prevent malfunction, be sure to input a low level to more than one of pins K
signal is entered externally.
repeatedly in each loop of the program.
K
REM
S
S
K
RESET
I/O
1
0
I
/LED
Note
Pin
INPUT mode
OUTPUT mode
I
Pin at Reset
Table 1-1. Connections for Unused Pins
High-level output
OUTPUT mode (LED) setting
OFF mode setting
Built-in POC circuit
Data Sheet U13595EJ2V0DS00
Inside the microcontroller
—
—
—
Connection
Open
Directly connected to GND
Open
Outside the microcontroller
I0
to K
PD61P34B
I3
when reset is
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