topic Re: Using SSP1 & use of MISO with it in LPCXpresso IDE

Using SSP1 & use of MISO with it

lpcware — Wed, 15 Jun 2016 23:14:38 GMT

Content originally posted in LPCWare by aamir ali on Sat Nov 03 02:44:46 MST 2012
I have an application where I have to send bytes at 12 Mhz freq to another module. So I selected SSP1 for this purpose. Now actually I need only SCLK & MOSI line. I don't need MISO line.

Earlier I have left float MISO, so module worked fine.

Now i haven't configure MISO line. & still my module is working fine with SCLK & MOSI. Data received is garbage.

1. Is it right to do so. i.e not configure Miso. If not, what could be risk.
Also can I use MISO pin alternate function like GPIO, as I don't need it know.

2. Also if I configure MISO, should I pull it up, pull down or float.

Re: Using SSP1 & use of MISO with it

lpcware — Wed, 15 Jun 2016 23:14:39 GMT

Content originally posted in LPCWare by gbm on Sat Nov 03 12:54:33 MST 2012
I don't quite understand why are you asking the question. Of course it is not obligatory to assign all SSP lines to SSP function if you don't need all of them. I have yet to see the application using SSEL h/w control.

And, of course, if you don't assign some line to SSP you may use it for any other purpose, like GPIO,

Re: Using SSP1 & use of MISO with it

lpcware — Wed, 15 Jun 2016 23:14:39 GMT

Content originally posted in LPCWare by modestt on Mon Nov 05 03:05:30 MST 2012
I thought it is more to do with how and where you receive the data at high speed, clock stabilization, rather then MISO line.