Dedicated Input Pin - Renesas M16C/6NK Hardware Manual

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M16C/6N Group (M16C/6NK, M16C/6NM)

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.
Figure 23.8 Circuit Connection
Rev.2.00 Nov 28, 2005
REJ09B0124-0200
Different power supply
VCC Dedicated
(e.g. NMI)
M16C/6NK, M16C/6NM
page 368 of 378
input pin
23. Usage Precaution