M16C6NK Datasheet, PDF (386/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
23. Usage Precaution
23.16 Dedicated Input Pin
When dedicated input pin voltage is larger than VCC pin voltage, latch up occurs.
When different power supplied to the system, and input voltage of unused dedicated input pin is larger than
voltage of VCC pin, connect dedicated input pin to VCC via resistor (approximately 1kΩ).
Figure 23.8 shows the circuit connection.
This note is also applicable when VINPUT exceeds VCC during power-up.
The resistor is not necessary when VCC pin voltage is same or larger than dedicated input pin voltage.
Different power supply
VCC
Dedicated
input pin
(e.g. NMI)
M16C/6NK, M16C/6NM
Figure 23.8 Circuit Connection
Rev.2.00 Nov 28, 2005 page 368 of 378
REJ09B0124-0200