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ADC software trigger usage



Hi,
About ADC module software trigger usage, according to TRM "Literature Number: SPNU489B",in section "15.3.6 How to start a conversion?", it says:


The conversion groups Group1 and Group2 are software-triggered by default. A conversion in these groups
can be started just by writing the desired channels to the respective Channel-Select Registers. For example,
in order to convert channels 0, 1, 2, and 3 in Group1 and channels 8, 9, 10, and 11 in Group2, the application
just has to write 0x0000000F to ADG1SEL and 0x00000F00 to ADG2SEL.

so, my question is:what should i do if i want to use software trigger? how to start a sample on the selected channels?