
Rev.2.10 Apr 14, 2006 page 368 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 23. Usage Notes
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 1 kΩ).
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.
Figure 23.8 Circuit Connection
VCC Dedicated
input pin
(e.g. NMI)
Different power supply
M16C/6NK, M16C/6NM
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