LPC MicrocontrollersのトピックRe: SSP: SSP-Slave, when does MISO go to Z?

SSP: SSP-Slave, when does MISO go to Z?

lpcware — Wed, 15 Jun 2016 19:13:01 GMT

Content originally posted in LPCWare by capiman on Sat Jan 24 03:04:20 MST 2015
Hello,

taken the case, that I want to use one SSP master and multiple SSP slaves
and LPC43xx is one of the slave. Each slave has it own CS line.

What is the criteria for SSP slave to put its MISO line to Z (tristate),
so other SSP slaves (like a serial flash) can work without interfering with LPC43xx?
Is it SSEL of SSP slave, which put MISO to Z?

Or must I do this by my own by? So when I detect my CS going low/high,
then I enable/disable MISO?

Or does LPC43xx not support this by itself and external hardware is needed to do this kind of multiplexing?

Best regards,

Martin

Re: SSP: SSP-Slave, when does MISO go to Z?

lpcware — Wed, 15 Jun 2016 19:13:02 GMT

Content originally posted in LPCWare by R2D2 on Sat Jan 24 03:31:02 MST 2015

Quote: capiman
Is it SSEL of SSP slave, which put MISO to Z?

Yes :)

Quote: capiman
How must I do this by my own by?

:~

You are coding your own SSP :quest:

Re: SSP: SSP-Slave, when does MISO go to Z?

lpcware — Wed, 15 Jun 2016 19:13:02 GMT

Content originally posted in LPCWare by capiman on Sat Jan 24 04:07:28 MST 2015
Many thanks for your fast answer!
(Changed my original posting from "How must I..." to "Or must I...")