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M16C/5L Group, M16C/56 Group
9.5
Reducing Power Consumption
To reduce power consumption, refer to the following descriptions when designing a system or writing
a program.
9.5.1
Ports
The MCU retains the state of each I/O port even when it enters wait mode or stop mode. A current flows
in the active output ports. A shoot-through current flows to the input ports in the high-impedance state.
Set the unassigned pins to input state, wait until the potential stabilizes, and then enter wait mode or
stop mode.
9.5.2
A/D Converter
When not performing A/D conversion, set the ADSTBY bit in the ADCON1 register to 0 (A/D operation
stopped).
9.5.3
Stopping Peripheral Functions
Use the CM02 bit in the CM0 register to stop the unnecessary peripheral functions while in wait mode.
9.5.4
Switching the Oscillation-Driving Capacity
Set the driving capacity to low when oscillation is stable.
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
9. Power Control
Page 136 of 803
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