External Trigger Source; Conversion Mode - WCH CH32V003 Series Reference Manual

CH32V003 Reference Manual
value written after the offset defined in the ADC_IOFRx register, there will be positive and negative cases, so
there are sign bits (SIGNB).
Rule group data register
D11 D10 D9 D8
Inject group data register
SIGNB D11 D10 D9
Rule group data register
0 0 0 0
Inject group data register
SIGNB SIGNB SIGNB SIGNB D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

9.2.3 External trigger source

The ADC conversion start event can be triggered by an external event. If the EXTTRIG or JEXTTRIG bits of
the ADC_CTLR2 register are set, the conversion of a rule group or injection group channel can be triggered
by an external event, respectively. In this case, the configuration of EXTSEL[2:0] and JEXTSEL[2:0] bits
determines the external event source for the rule group and injection group.
EXTSEL[2:0]
000
001
010
011
100
101
110
111
Table 9-2 External trigger sources for injection group channels
JEXTSEL[2:0]
000
001
010
011
100
101
110
111

9.2.4 Conversion mode

ADC_CTLR1 and ADC_CTLR2 register control bits
CONT SCAN RDISCEN/IDISCEN IAUTO
0
0
1
V1.3
Figure 9-2 Data left alignment
D7 D6 D5 D4
D8 D7 D6
Figure 9-3 Data right alignment
D11 D10 D9 D8
Table 9-1 External trigger sources for rule group channels
Trigger source
TRGO event of timer 1
CH1 event of timer 1
CH2 event of timer 1
TRGO event of timer 2
CH1 event of timer 2
CH2 event of timer 2
PD3/PC2 events
SWSTART software trigger
Trigger source
CH3 event of timer 1
CH4 event of timer 1
CH3 event of timer 2
CH4 event of timer 2
-
-
PD1/PA2
JSWSTART software trigger
Table 9-3 Conversion mode combinations
0 0
0 0
D4 D2 D1
D5 D4 D3 D2
D7 D6 D5
Internal signal from on-chip
Internal signal from on-chip
Start event
ADON Single single-channel mode: A rule
position 1 channel performs a single conversion.
External Single single-channel mode: A single
trigger conversion is performed on one of the rule
method channels or injection channels.
ADON Single scan mode: performs a single
position 1 conversion of all selected rule group
or external channels (ADC_RSQRx) or all injection
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D0 0 0 0
D1 D0 0 0
D4 D3 D2 D1
Type
timer
From external pins
Software control bits
Type
timer
From external pins
Software control bits
ADC conversion mode
0
0
D0