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MESC TECHNICAL NEWS

No.M16C-11-9710

GRADE

Note on dedicated input pin of the M16C/60 series MCU

1. Related devices

M16C/60 series

2. Note on dedicated input pin

When different power supplied to the system as shown in figure 1, and input voltage of unused

dedicated input pin is larger than voltage of VCC pin, do not connect dedicated input pin and

power supply directly. Connect to VCC via resistor (approximately 1kohm) as shown in figure

2. This note is also applicable when VINPUT exceeds VCC during power-up.

( 1 / 1 )

Figure 1. Circuit diagram Figure 2. Improved circuit diagram

Different power supply

Dedicated

input pin

(e.g. NMI)

M16C/60 series

microcomputer

Different power supply

Dedicated

input pin

(e.g. NMI)

VCC

M16C/60 series

microcomputer

* The resistor is not necessary when VCC pin voltage is same or larger than dedicated input pin voltage.

3. Cause

When dedicated input pin voltage is larger than VCC pin voltage, latch up occurs.

Related to M16C/80, M16C/60, M16C/20 series devices.

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Renesas Single-Chip Microcomputer M37531T-ADS Technical Information Seite 24