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specs to fulfill in ultra-low energy mode

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a Launchpad MSP-EXP430FR4133 should work as a custom digital watch, possibly with a time drift <5’ a year. The time will be displayed on the LCD when button P1 is pressed.

At the same time, the Lauchpad should serve a serial interrupt because periodically (say once a month) the device will exchange data with a PC application.

All of this should be operated in ultra-low energy mode so that a battery will last as long as possible (one year or longer).

Are these concurrent features possible ?

Somebody says that ultra-low energy mode is possible for a Launchpad only if RX and TX onboard jumpers are set to OFF, but I hope that Mr. Doom is wrong :)

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