>Please let me know if this kind of usage is allowed with MSP430. Sorry, I have no other option than to say: this kind of usage is allowed but stupid. Actually no matter which low power microcontroller used. Power consumption definitely is lower by using sleep instead of wasteful reinitialization of msp430 hardware and user firmware data/state 20 times per second(!). If sleep time is minute or longer - then it could be option to use some nanopower timer mentioned. But for god's sake not using "RST pin has 100kΩ＋100nF in order to provide more delay during power-up".
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