topic Re: s12xs Temperature Sensor in S12 / MagniV Microcontrollers

s12xs Temperature Sensor

alexkey — Tue, 04 Nov 2014 09:18:35 GMT

Hi all,

i have been trying in vain to get the voltage regulator Temperature Sensor mapped to an ADC channel. the thing is i can't find which channel it gets mapped to. The datasheet and AN3624 seem to imply that it is mapped to ATD channel 17. But i have no way of accessing this.

Am I missing something completely obvious?

thanks

Re: s12xs Temperature Sensor

DPB — Tue, 04 Nov 2014 09:34:21 GMT

Hello

ATD0 channel 17 can be accessed by writing 0x41 to ATDCTL5.

i.e. SC should be set and CD,CC,CB,CA should be 0,0,0,1 respectively.

Or do you use this config already?

If so, can you convert other channels successfully?

DPB

Re: s12xs Temperature Sensor

alexkey — Tue, 04 Nov 2014 09:51:36 GMT

Hi, i am already using this config. I think my real question is in fact what register name should i be using to access the data.

e.g. for reading channels 0 - 4 i use ATD0DR0 - ATD0DR3 but there doesn't seem to be a ATD0DR16

thanks

Re: s12xs Temperature Sensor

DPB — Tue, 04 Nov 2014 10:45:51 GMT

Hello

The first result by default should be stored to ATD0DR0-3.

By default means with the ATDCTL3 reset value of 0x20. This ATDCTL3 configuration uses a sequence of 4 conversions.

So the results are stored in ATD0DR0, ATD0DR1, ATD0DR2, ATD0DR3 respectively, with the input mapped to the temperature sensor ATDCTL5 =0x41.

i.e. all conversions are from the same channel because MULT=0.

So the registers should contain similar values, as the temperature does not vary so quickly.

DPB

Re: s12xs Temperature Sensor

alexkey — Tue, 04 Nov 2014 11:32:48 GMT

Thank you so much I now have this up and running correctly!

Very much appreciated!