Data Alignment; Figure 32. Right Alignment Of 12-Bit Data; Figure 33. Left Alignment Of 12-Bit Data; Figure 34. Left Alignment Of 6-Bit Data - ST STM32F205 series Reference Manual

Analog-to-digital converter (ADC)
10.4

Data alignment

The ALIGN bit in the ADC_CR2 register selects the alignment of the data stored after
conversion. Data can be right- or left-aligned as shown in
The converted data value from the injected group of channels is decreased by the user-
defined offset written in the ADC_JOFRx registers so the result can be a negative value.
The SEXT bit represents the extended sign value.
For channels in a regular group, no offset is subtracted so only twelve bits are significant.
Injected group
SEXT
Regular group
0
Injected group
SEXT
Regular group
D11
Special case: when left-aligned, the data are aligned on a half-word basis except when the
resolution is set to 6-bit. in that case, the data are aligned on a byte basis as shown in
Figure 34.
Injected group
SEXT
Regular group
0
220/1378

Figure 32. Right alignment of 12-bit data

SEXT SEXT SEXT D11 D10
0 0 0 D11 D10

Figure 33. Left alignment of 12-bit data

D11 D10 D9 D8 D7
D10 D9 D8 D7

Figure 34. Left alignment of 6-bit data

SEXT SEXT SEXT SEXT SEXT
0 0 0 0
D9 D8 D7 D6
D9 D8 D7 D6
D6 D3
D5 D4
D6 D5 D4 D3 D2
SEXT SEXT SEXT
D5
0 0 0 D5 D4
RM0033 Rev 8
Figure 32 and Figure
D5 D4 D3 D2 D1
D5 D4 D3 D2
D2 D1 D0 0
D1 D0 0 0
D3 D2 D1 D0
D4
D3 D2 D1 D0
RM0033
33.
D0
D1 D0
ai16050
0 0
0 0
ai16051
0
0 0
ai16052