topic s12zvm ADC question in S12 / MagniV Microcontrollers

s12zvm ADC question

sohyunjang — Wed, 06 Sep 2017 08:33:45 GMT

I use MC9S12ZVML128_PMSM (single shunt).

And I wonder that meaning of <<The results are stored in memory as 12-bit (ADC0FMT_SRES = 4; ADC1FMT_SRES = 4) left-justified data (ADC0FMT_DJM = 0; ADC1FMT_DJM = 0)>> in manual.

what is meaning of <<left-justifted data>>?

Re: s12zvm ADC question

danielmartynek — Wed, 06 Sep 2017 14:06:42 GMT

Hi,

This is described in the Reference manual.

See Chapter 9.5.2.5 ADC Format Register (ADCFMT)

If ADCFMT_DJM = 0, data are left-justified in the conversion result list.

Then in Table 9-33, you can see the justification.

If left justified, the result is stored in the most significant bits.

Regards,

Daniel