Table 76. Maximum Output Results Vs N And M. Grayed Values Indicates Truncation; Figure 55. Numerical Example With 5-Bits Shift And Rounding - ST STM32G0 1 Series Reference Manual

Analog-to-digital converter (ADC)
Raw 20-bit data:
The Table 76
conversion data equal to 0xFFF.

Table 76. Maximum output results vs N and M. Grayed values indicates truncation

No-shift
Oversa
Max
mpling
OVSS =
Raw data
ratio
2x 0x1FFE 0x1FFE
4x 0x3FFC 0x3FFC
8x 0x7FF8 0x7FF8
16x 0xFFF0 0xFFF0
32x 0x1FFE0 0xFFE0
64x 0x3FFC0 0xFFC0
128x 0x7FF80 0xFF80
256x 0xFFF00 0xFF00
The conversion timings in oversampled mode do not change compared to standard
conversion mode: the sample time is maintained equal during the whole oversampling
sequence. New data are provided every N conversion, with an equivalent delay equal to N x
t = N x (t
CONV
•
the end of the sampling phase (EOSMP) is set after each sampling phase
•
the end of conversion (EOC) occurs once every N conversions, when the oversampled
result is available
• the end of sequence (EOCSEQ) occurs once the sequence of oversampled data is
completed (i.e. after N x sequence length conversions total)
374/1390

Figure 55. Numerical example with 5-bits shift and rounding

19
3
Final result after 5-bits shift
and rounding to nearest
below gives the data format for the various N and M combination, for a raw
1-bit 2-bit
shift shift
OVSS = OVSS =
0000
0001 0010
0x0FFF 0x0800
0x1FFE 0x0FFF
0x3FFC 0x1FFE
0x7FF8 0x3FFC
0xFFF0 0x7FF8
0xFFE0 0xFFF0
0xFFC0 0xFFE0
0xFF80 0xFFC0
+ t ). The flags features are raised as following:
SMPL SAR
15 11
B
15
1 D
3-bit 4-bit
shift shift
OVSS = OVSS =
0011 0100
0x0400 0x0200
0x0800 0x0400
0x0FFF 0x0800
0x1FFE 0x0FFF
0x3FFC 0x1FFE
0x7FF8 0x3FFC
0xFFF0 0x7FF8
0xFFE0 0xFFF0
RM0444 Rev 5
7 3
7 D
B
5-bit 6-bit
shift shift
OVSS = OVSS = OVSS =
0101 0110
0x0100 0x0080 0x0040
0x0200 0x0100 0x0080
0x0400 0x0200 0x0100
0x0800 0x0400 0x0200
0x0FFF 0x0800 0x0400
0x1FFE 0x0FFF 0x0800
0x3FFC 0x1FFE 0x0FFF
0x7FF8 0x3FFC 0x1FFE
RM0444
7
0
F
MS31929V1
7-bit 8-bit
shift shift
OVSS =
0111 1000
0x0020
0x0040
0x0080
0x0100
0x0200
0x0400
0x0800
0x0FFF