Use of the STE pin in 3-pin SPI mode

David Pfaltzgraff

Other Parts Discussed in Thread: MSP430F4616

As I understand it, when the USCI is operated as a master in 3-pin mode, the pin allocated to STE is a 'regular' I/O pin and must be programmed as such. For example on the MSp430F4616, pin 45 is just P7.0.

Am I interpreting this correctly?

Thanks.

over 12 years ago

0 Jens-Michael Gross over 12 years ago

Guru 227245 points

David Pfaltzgraff said:
Am I interpreting this correctly?

Yes. For single master SPI, you don't need STE at all. And for combined slave/master operation, STE only handles the immediate need to shut up your outputs, it doesn't remove the need to interpret this signal by software for proper oepration/resetting the USCI etc.
In maste rmode, you'll need a dedicated CS line for every slave anyway, independently of STE.

0 David Pfaltzgraff over 12 years ago in reply to Jens-Michael Gross

Expert 2425 points

That was what I thought, but I wasnted to be sure before I got in too deep.

Thanks

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Use of the STE pin in 3-pin SPI mode