28x1 Multiple hser devices?

BCJKiwi

Senior Member
Since there is no progress on hspi for the Vdrive2 I need to consider hser for this device (which does work).

However I am already using hser for another device (OBDII).
I have always assumed that hardware serial could only talk to one device. Just in case this is not so does anyone have a suggestion on how to implement 2 hser devices on a 28x1?

Thanks
 

hippy

Technical Support
Staff member
It will require some form of multiplexing, routing or switching of signals under program control. It may be possible to do it with just diodes but a quad 2-to-1 selector, as a part or built from other logic gates would probably be the best bet.
 

BCJKiwi

Senior Member
Thanks Hippy, I thought something like that may be the only way. I was not sure if signal levels would need to be maintained on the 'dormant' serial device to ensure there were no delays when switching back and forth.

I presume the AD8153 or 54LS157 type devices are what you had in mind.
 
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