SPRZ193T January 2003 – December 2023 SM320F2812 , SM320F2812-EP , SMJ320F2812 , TMS320F2810 , TMS320F2810-Q1 , TMS320F2811 , TMS320F2811-Q1 , TMS320F2812 , TMS320F2812-Q1
ADC: EOS BUF1/2 Bits in ADCST Corrupted at the End of Conversion of Sequencer 1/2 When INT MOD SEQ1/2 is Enabled
0, A, B, C, D, E, F and G
Setting the INT MOD SEQx bit in ADCTRL2 as per the user guide should result in the ADC wrapper generating INT SEQx at the end of every other conversion rather than at the end of every conversion. Also, EOS BUFx will be set at the end of every conversion to track the status of the SEQx in use. However, a conversion on SEQ1 will cause EOS_BUF2 to be set if INT_MOD_SEQ2 is enabled for that sequencer, even if INT_MOD_SEQ1 is not enabled.
For example, if INT_MOD_SEQ2 is set, a conversion on SEQ1 will cause the EOS_BUF2 bit to be set incorrectly. This will cause INT SEQ2 to be set incorrectly after the next SEQ2 completion. If EOS_BUF2 is already set (from previous SEQ conversion), a conversion on SEQ1 will cause EOS_BUF2 to be cleared causing the interrupt to be missed. The above relationship is also true for SEQ2 affecting SEQ1. In all cases, the sequencers do work correctly, with the exception that EOS BUFx gets corrupted.
Do not use the INT_MOD_SEQx feature if both SEQ1 and SEQ2 will be used before two completions of sequence have completed on the INT_MOD_SEQ selected sequencer.