CCS/MSP430F6779: CCS/MSP430F6779

Krzysztof Turchan

Prodigy 55 points

Part Number: MSP430F6779

Tool/software: Code Composer Studio

Hello everyone,

I have a trouble with my MSP430 microcontroller.
I can not enter a Low Power Mode.

I use command: __bis_SR_register(LPM3_bits) and it doesn't have any effect.

Is there any command or configuration to unlock LPM before __bis_SR_register(LPM3_bits) ?

Best regards
Krzysztof

over 5 years ago

0 Bruce McKenney over 5 years ago

Guru 99455 points

How can you tell that it doesn't go into LPM? Does it keep executing (without an intervening wakeup)? Or is it based on power consumption?

0 Krzysztof Turchan over 5 years ago in reply to Bruce McKenney

Prodigy 55 points

Hi, thanks for your answer.

Information that it does not work is based on power consumption.
I found an information that the MSP430F5xx and F6xx is keeping clock on no matter which LPM is used.
https://youtu.be/CsV2LrdAyaw?t=566

Do you know how to enable LPM on MSP430F5xx?

Best regards,
Krzysztof

0 Bruce McKenney over 5 years ago in reply to Krzysztof Turchan

Guru 99455 points

What sort of power consumption do you see?

One place to start is Example MSP430F677x_LPM3_03.c:

http://dev.ti.com/tirex/explore/node?node=AFxMoaDPKa9aUlFvciSxHQ__IOGqZri__LATEST

This is actually one of four LPM3_0x variants (check the panel on the left). This one doesn't require anything outside the chip.

I expect you're using a custom board, so you should probably audit the GPIO configs (lines 76 ff) to make sure none of them sets up a bus conflict with some external device on your board.

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

CCS/MSP430F6779: CCS/MSP430F6779