PXS20RM Datasheet, PDF (172/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Analog-to-Digital Converter (ADC)
9.3.9 Presampling registers
9.3.9.1 Presampling Control Register (PSCR)
Address: Base + 0x080
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R0 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
R0 0 0 0 0 0 0 0 0 0 0 0 0
PRE
W
PREVAL0 CON
V
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 9-12. Presampling Control Register (PSCR)
Table 9-14. PSCR field descriptions
Field
PREVAL0
PRECONV
Description
Internal voltage selection for presampling (see Table 9-15)
00 Select the V0 internal presampling voltage
01 Select the V1 internal presampling voltage
10 Reserved
11 Reserved
Convert presampled value
0 The ADC will perform a sampling followed by a conversion
1 The ADC will perform a presampling followed by a conversion (the sampling is bypassed, so the
conversion result is that of the presampled value)
Table 9-15. Presampling voltages
PSCR[PREVAL0] voltage label
Voltage for ADC_0
V0
VDD_HV_ADR0
V1
VSS_HV_ADR0
Voltage for ADC_1
VDD_HV_ADR1
VSS_HV_ADR1
9-14
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor