RM0440 Rev 4 659/2126
RM0440 Analog-to-digital converters (ADC)
724
ADCy_AWDx_OUT signal output generation
Each analog watchdog is associated to an internal hardware signal ADCy_AWDx_OUT
(y=ADC number, x=watchdog number) which is directly connected to the ETR input
(external trigger) of some on-chip timers. Refer to the on-chip timers section to understand
how to select the ADCy_AWDx_OUT signal as ETR.
ADCy_AWDx_OUT is activated when the associated analog watchdog is enabled:
• ADCy_AWDx_OUT is set when a guarded conversion is outside the programmed
thresholds.
• ADCy_AWDx_OUT is reset after the end of the next guarded conversion which is
inside the programmed thresholds (It remains at 1 if the next guarded conversions are
still outside the programmed thresholds).
• ADCy_AWDx_OUT is also reset when disabling the ADC (when setting ADDIS=1).
Note that stopping regular or injected conversions (setting ADSTP=1 or JADSTP=1)
has no influence on the generation of ADCy_AWDx_OUT.
Note: AWDx flag is set by hardware and reset by software: AWDx flag has no influence on the
generation of ADCy_AWDx_OUT (ex: ADCy_AWDx_OUT can toggle while AWDx flag
remains at 1 if the software did not clear the flag).
Figure 126. ADCy_AWDx_OUT signal generation (on all regular channels)
Table 171. Analog watchdog 2 and 3 comparison
Resolution
(bits RES[1:0])
Analog watchdog comparison between:
Comments
Raw converted data,
left aligned
(1)
Thresholds
00: 12-bit DATA[11:4] LTx[7:0] and HTx[7:0] DATA[3:0] are not relevant for the comparison
01: 10-bit DATA[11:4] LTx[7:0] and HTx[7:0] DATA[3:2] are not relevant for the comparison
10: 8-bit DATA[11:4] LTx[7:0] and HTx[7:0] -
11: 6-bit DATA[11:6],00 LTx[7:0] and HTx[7:0] User must configure LTx[1:0] and HTx[1:0] to 00
1. Refer to Section : Gain compensation for additional details on analog watchdog comparison.
EOC FLAG
ADC
STATE
RDY
AWDx FLAG
Conversion1
outside
ADCy_AWDx_OUT
inside
cleared
by S/W
- Converting regular channels 1,2,3,4,5,6,7
- Regular channels 1,2,3,4,5,6,7 are all guarded
MS31025V1
Conversion2 Conversion3 Conversion4 Conversion5 Conversion6 Conversion7
outsideinside outside outside inside
cleared
by S/W
cleared
by S/W
cleared
by S/W
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