topic Need help about S12 ADC in S12 / MagniV Microcontrollers

Need help about S12 ADC

fanziyu — Fri, 17 Aug 2018 07:45:24 GMT

Question1:e6181 workaround: The ADC should not be disabled before any flow control request (SEQA,TRIG,RSTA)is finished(all flow control bits are cleared).

ADC0CTL_0_ADC_SR = 1;//execute ADC soft-reset(SR),ADC enters IDLE state
while(ADC0STS_READY == 0){}
ADC0CTL_0 = 0X00;//ADC is disabled

ADC0CTL_0_ADC_SR = 1;
while(ADC0STS_READY == 0){}

ADC0FLWCTL = 0X80;//need?

while(0 != ADC0FLWCTL ){}//need?

ADC0CTL_0 = 0X00;//ADC is disabled

Are both the programs correct?

Question2:ATD clock Frequency is 3MHz.10 bit resolution .Then one conversion time ?

if CSL with 17 command entries,then how much time it will cost toally? more details see attachment

thanks!

Re: Need help about S12 ADC

danielmartynek — Tue, 21 Aug 2018 13:16:41 GMT

Hi,
As the workaround for e6181 states,
“It is recommended to issue a Sequence Abort Request and to poll bit SEQA to be clear before ADC is disabled via bit ADCEN.”

  ADC0FLWCTL_SEQA = 1;     // Issue a Sequence Abort Request
  while(ADC0FLWCTL_SEQA){} // Wait until aborted
  ADC0CTL_0_ADC_EN = 0;        // Disable ADC‍‍‍

The conversion time was discussed in this thread:
S12ZVLA ADC sampling time

Regards,
Daniel

Re: Need help about S12 ADC

fanziyu — Mon, 27 Aug 2018 05:00:59 GMT

thans for your help.Daniel.I wonder if adc is in idle status,i still have to issue a Sequence Abort Request?

ADC0CTL_0_ADC_SR = 1;//execute ADC soft-reset(SR),ADC enters IDLE state