RM0440 Rev 4 697/2126
RM0440 Analog-to-digital converters (ADC)
724
Bit 13 CONT: Single / continuous conversion mode for regular conversions
This bit is set and cleared by software. If it is set, regular conversion takes place continuously until it
is cleared.
0: Single conversion mode
1: Continuous conversion mode
Note: It is not possible to have both discontinuous mode and continuous mode enabled: it is forbidden
to set both DISCEN=1 and CONT=1.
The software is allowed to write this bit only when ADSTART=0 (which ensures that no regular
conversion is ongoing).
When dual mode is enabled (DUAL bits in ADCx_CCR register are not equal to zero), the bit
CONT of the slave ADC is no more writable and its content is equal to the bit CONT of the
master ADC.
Bit 12 OVRMOD: Overrun mode
This bit is set and cleared by software and configure the way data overrun is managed.
0: ADC_DR register is preserved with the old data when an overrun is detected.
1: ADC_DR register is overwritten with the last conversion result when an overrun is detected.
Note: The software is allowed to write this bit only when ADSTART=0 (which ensures that no regular
conversion is ongoing).
Bits 11:10 EXTEN[1:0]: External trigger enable and polarity selection for regular channels
These bits are set and cleared by software to select the external trigger polarity and enable the
trigger of a regular group.
00: Hardware trigger detection disabled (conversions can be launched by software)
01: Hardware trigger detection on the rising edge
10: Hardware trigger detection on the falling edge
11: Hardware trigger detection on both the rising and falling edges
Note: The software is allowed to write these bits only when ADSTART=0 (which ensures that no
regular conversion is ongoing).
Bits 9:5 EXTSEL[4:0]: External trigger selection for regular group
These bits select the external event used to trigger the start of conversion of a regular group:
00000: Event 0
00001: Event 1
00010: Event 2
00011: Event 3
00100: Event 4
00101: Event 5
00110: Event 6
00111: Event 7
...
11111: Event 31
Note: The software is allowed to write these bits only when ADSTART=0 (which ensures that no
regular conversion is ongoing).
Bits 4:3 RES[1:0]: Data resolution
These bits are written by software to select the resolution of the conversion.
00: 12-bit
01: 10-bit
10: 8-bit
11: 6-bit
Note: The software is allowed to write these bits only when ADSTART=0 and JADSTART=0 (which
ensures that no conversion is ongoing).
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