Renesas 16-bit single-chip microcomputer Manual Do Utilizador

Rev.1.02    Jul 01, 2005    page 280 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

22. Usage Precaution

This document is under development and its contents are subject to change.

Suggestions to reduce power consumption.

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.

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).

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”.

Set the driving capacity to “LOW” when oscillation is stable.