MPC565, AN64 to AN79 not working

Hello all,

I have a new MPC565 design which is trying to emulate the QADC from the
MPC555. I have set up the ccw table on QADC_A to convert channels 44 to
59 (AN44 to AN59) and the CCW on QADC_B to convert 64 to 79 (AN64 to
79). When I test this operation channels 44 to 59 work perfectly but 64
to 79 are not working. Looking at the status of QADC_B it seems that
conversions are taking place.

If I get QADC_B to convert 44 to 59, this works, and conversely QADC_A
converting 64 to 79 does not work. Channels 80 to 89 work on both QADCs.

I noticed that the MPC565 manual states the pad type for AN 44 to 59 is
'input/output' but for AN 64 to 79 'AMUX Input'. Is there somewhere
where I need to 'switch on' this pads so the QADCs can see them?

Any help would be greatly appreciated.

Thanks
Pete

Pete James
Technical Specialist/Chief Engineer - Electronics & Software
Prodrive
Kenilworth
Warwickshire
CV8 1NR
UK
DDI - +44 (0) 1676 536023
Email - [email protected]