RM0033 Rev 9 219/1381
RM0033 Analog-to-digital converter (ADC)
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Example:
• n = 3, channels to be converted = 0, 1, 2, 3, 6, 7, 9, 10
• 1st trigger: sequence converted 0, 1, 2. An EOC event is generated at each
conversion.
• 2nd trigger: sequence converted 3, 6, 7. An EOC event is generated at each
conversion
• 3rd trigger: sequence converted 9, 10.An EOC event is generated at each conversion
• 4th trigger: sequence converted 0, 1, 2. An EOC event is generated at each conversion
Note: When a regular group is converted in discontinuous mode, no rollover occurs.
When all subgroups are converted, the next trigger starts the conversion of the first
subgroup. In the example above, the 4th trigger reconverts the channels 0, 1 and 2 in the
1st subgroup.
Injected group
This mode is enabled by setting the JDISCEN bit in the ADC_CR1 register. It can be used to
convert the sequence selected in the ADC_JSQR register, channel by channel, after an
external trigger event.
When an external trigger occurs, it starts the next channel conversions selected in the
ADC_JSQR registers until all the conversions in the sequence are done. The total sequence
length is defined by the JL[1:0] bits in the ADC_JSQR register.
Example:
n = 1, channels to be converted = 1, 2, 3
1st trigger: channel 1 converted
2nd trigger: channel 2 converted
3rd trigger: channel 3 converted and JEOC event generated
4th trigger: channel 1
Note: When all injected channels are converted, the next trigger starts the conversion of the first
injected channel. In the example above, the 4th trigger reconverts the 1st injected channel
1.
It is not possible to use both the auto-injected and discontinuous modes simultaneously.
Discontinuous mode must not be set for regular and injected groups at the same time.
Discontinuous mode must be enabled only for the conversion of one group.
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