First and foremost method is to use the M8C_Sleep macro. This powers down the internal main oscillator (IMO), flash memory, and the bandgap voltage reference.
The other power saving techniques:
1. Disable Analog Block References
2. Disable Analog Buffers
3. Disable CT/SC Blocks
4. Set GPIO Drive Modes to Analog HI-Z
For more details on topics like sleep mode basics, wakeup sources, and special sleep mode considerations, please refer to http://www.cypress.com/?rID=34189
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