Analog-to-digital converter (ADC) RM0390
396/1328 RM0390 Rev 4
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. TSVREFE VBATE Res. Res. Res. Res. ADCPRE
rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
DMA[1:0] DDS Res. DELAY[3:0] Res. Res. Res. MULTI[4:0]
rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:24 Reserved, must be kept at reset value.
Bit 23 TSVREFE: Temperature sensor and V
REFINT
enable
This bit is set and cleared by software to enable/disable the temperature sensor and the
V
REFINT
channel.
0: Temperature sensor and V
REFINT
channel disabled
1: Temperature sensor and V
REFINT
channel enabled
Note: VBATE must be disabled when TSVREFE is set. If both bits are set, only the VBAT
conversion is performed.
Bit 22 VBATE: V
BAT
enable
This bit is set and cleared by software to enable/disable the V
BAT
channel.
0: V
BAT
channel disabled
1: V
BAT
channel enabled
Bits 21:18 Reserved, must be kept at reset value.
Bits 17:16 ADCPRE: ADC prescaler
Set and cleared by software to select the frequency of the clock to the ADC. The clock is
common for all the ADCs.
Note: 00: PCLK2 divided by 2
01: PCLK2 divided by 4
10: PCLK2 divided by 6
11: PCLK2 divided by 8
Bits 15:14 DMA: Direct memory access mode for multi ADC mode
This bit-field is set and cleared by software. Refer to the DMA controller section for more
details.
00: DMA mode disabled
01: DMA mode 1 enabled (2 / 3 half-words one by one - 1 then 2 then 3)
10: DMA mode 2 enabled (2 / 3 half-words by pairs - 2&1 then 1&3 then 3&2)
11: DMA mode 3 enabled (2 / 3 bytes by pairs - 2&1 then 1&3 then 3&2)
Bit 13 DDS: DMA disable selection (for multi-ADC mode)
This bit is set and cleared by software.
0: No new DMA request is issued after the last transfer (as configured in the DMA
controller). DMA bits are not cleared by hardware, however they must have been cleared
and set to the wanted mode by software before new DMA requests can be generated.
1: DMA requests are issued as long as data are converted and DMA = 01, 10 or 11.
Bit 12 Reserved, must be kept at reset value.
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