PXN20RM Datasheet, PDF (1102/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

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