NXP Semiconductors PXN2020 - 34.3.2.19 Presampling Control Register (PSCR); 34.3.2.20 Presampling Register 0 (PSR0)

Analog-to-Digital Converter (ADC)
PXN20 Microcontroller Reference Manual, Rev. 1
34-22 Freescale Semiconductor
34.3.2.19 Presampling Control Register (PSCR)
34.3.2.20 Presampling Register 0 (PSR0)
The PSR0 register contains the Presampling Enable bits for group 0 channels (channels 0–31).
Address: ADC_BASE + 0x0080 Access: User read/write
0123456789101112131415
R0000000000000000
W
Reset0000000000000000
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R000000000
PREVAL2 PREVAL1 PREVAL0
PRE
CONV
W
Reset0000000000000000
Figure 34-20. Presampling Control Register (PSCR)
Table 34-20. PSCR Field Descriptions
Field Description
PREVAL2 Internal voltage selection for Presampling. Selects analog input voltage for presampling from the available four
internal voltages (group 2 channels).
PREVAL1 Internal voltage selection for Presampling. Selects analog input voltage for presampling from the available four
internal voltages (group 1 channels).
PREVAL0 Internal voltage selection for Presampling. Selects analog input voltage for presampling from the available four
internal voltages (group 0 channels).
PRECONV Convert Presampled value. If bit PRECONV is set, presampling is followed by the conversion. Sampling is
bypassed and conversion of presampled data is performed.
Address: ADC_BASE + 0x0084 Access: User read/write
0123456789101112131415
R
PRES
31
PRES
30
PRES
29
PRES
28
PRES
27
PRES
26
PRES
25
PRES
24
PRES
23
PRES
22
PRES
21
PRES
20
PRES
19
PRES
18
PRES
17
PRES
16
W
Reset0000000000000000
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
PRES
15
PRES
14
PRES
13
PRES
12
PRES
11
PRES
10
PRES
9
PRES
8
PRES
7
PRES
6
PRES
5
PRES
4
PRES
3
PRES
2
PRES
1
PRES
0
W
Reset0000000000000000
Figure 34-21. Presampling Register 0 (PSR0)