Table 359. Csr Field Descriptions - STMicroelectronics SPC572L series Reference Manual

Sigma-Delta Analog-to-Digital Converter (SDADC) Digital Interface
Offset 0x0004
0 1
R 0 0
W
Reset 0 0
16 17
R 0 0
W
Reset 0 0
Field
0–7 Reserved
Bias enable
8–15
If BIASEN[i] = 1, analog input AN[i] (could be single-ended input or differential analog input) is
BIASEN[7:0]
connected to half-scale bias through a 100 KΩ resistor.
16–20 Reserved
Analog Channel Selection Wraparound Value (ANCHSEL_WRAP)
21–23
When in wraparound mode, this field indicates the maximum value of the wraparound counter,
ANCHSEL_WRAP after which it will wrap around back to initial value 000. This value should be programmed
before enabling wraparound mechanism (MCR[WRMODE] = 1).
24–28 Reserved
Analog Channel Selection (ANCHSEL)
Based on single-ended or differential mode of operation (MCR[MODE]), common mode
voltage selection (MCR[VCOMSEL]), this field defines the connectivity of analog inputs to
either positive or negative polarity terminals of the SDADC according to
Wraparound Mode:
– This field also indicates the initial entry value for the first loop of the wraparound sequence
29–31
ANCHSEL
– If this field is written any time during wraparound mode (when MCR[WRMODE] = 1), the
– Wraparound will always be from initial counter value 000.
740/2058
2 3 4 5
0 0 0 0
0 0 0 0
18 19 20 21
0 0 0
ANCHSEL_WRAP
0 0 0 0
Figure 316. Channel Selection Register (CSR)

Table 359. CSR field descriptions

from where the wraparound counter will start incrementing when wraparound mode is
entered (when wraparound mechanism enabled (MCR[WRMODE] = 1)).
present value of the wraparound counter will be updated with the value of ANCHSEL — the
next trigger will act on the updated channel, and the next increment will be on the updated
channel. Here, the value of ANCHSEL chosen should be < ANCHSEL_WRAP; otherwise it
will be ignored by hardware.
DocID027809 Rev 4
6 7 8 9
0 0
0 0 0 0
22 23 24 25
0 0
0 0 0 0
Description
Access: User Read/Write
10 11 12 13
BIASEN
0 0 0 0
26 27 28 29
0 0 0
ANCHSEL
0 0 0 0
Table 360.
RM0400
14 15
0 0
30 31
0 0