Hello All,

I have 2 MSP430 connected via an SPI bus, one is a master and the other is a slave.
The SPI bus is not working all the time, and I have an interrupt line to signal from the Master to the Slave when to start the SPI (configure the port).

I manage to reduce power consumption (about 80uA at each side) by setting the SPI logic to RESET (in the USCI module it is simply by setting

UCB0CTL1 |= UCSWRST;

Will I save MORE power if I reset the ports to input?

P3SEL &= ~0x0E; P3DIR &= ~0x0E;

I don't have a sensitive current measurement tool to answer this question.

Ohad.

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--- In m..., ohad.gal@... wrote:
>
> Hello All,
>
> I have 2 MSP430 connected via an SPI bus, one is a master and the other is a slave.
> The SPI bus is not working all the time, and I have an interrupt line to signal from the Master to the Slave when to start the SPI (configure the port).
>
> I manage to reduce power consumption (about 80uA at each side) by setting the SPI logic to RESET (in the USCI module it is simply by setting
>
> UCB0CTL1 |= UCSWRST;
>
> Will I save MORE power if I reset the ports to input?
>
> P3SEL &= ~0x0E; P3DIR &= ~0x0E;
>
> I don't have a sensitive current measurement tool to answer this question.
>
> Ohad.
>

Hi!

Have you found any solution to your question? Because I am wondering the same thing right now, too.

Thanks!

nikos

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