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Rev.1.02 Jul 01, 2005 page 280 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 22. Usage Precaution
Under development
This document is under development and its contents are subject to change.
Suggestions to reduce power consumption.
Ports
The processor retains the state of each I/O port even when it goes to wait mode or to stop mode.
A current flows in active I/O ports. A pass current flows in input ports that high-impedance state.
When entering wait mode or stop mode, set non-used ports to input and stabilize the potential.
A/D converter
When A/D conversion is not performed, set the VCUT bit in the ADCON1 register to “0” (VREF not
connection). When A/D conversion is performed, start the A/D conversion at least 1 µs or longer after
setting the VCUT bit to “1” (VREF connection).
D/A converter
When not performing D/A conversion, set the DAiE bit (i = 0, 1) in the DACON register to “0” (input
disabled) and DAi register to “00h”.
Switching the oscillation-driving capacity
Set the driving capacity to “LOW” when oscillation is stable.