PXN20RM Datasheet, PDF (1088/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Analog-to-Digital Converter (ADC)
34.3.2 ADC Register Descriptions
This section lists the ADC registers in address order and describes the registers and their bit fields.
34.3.2.1 Main Configuration Register (MCR)
The MCR provides configuration settings for the ADC.
Address: ADC_BASE + 0x0000
0
1
2
3
4
5
6
7
8
R
W
OWR
EN
WL
SIDE
MODE
EDG
LEV
TR
GEN
EDGE
XSTR
TEN
N
START
0
Reset 0
0
0
0
0
0
0
0
0
Access: User read/write
9
10 11 12
JTR J
J
0
GEN EDGE START
0
0
0
0
13 14 15
0 _CTU 0
EN
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
ADCLK
SEL
ABORT
CHAIN
ABORT
ACKO
OFFRE
FRESH
OFFC
ANC
0
0
PWDN
Reset 0
0
0
0
0
0
0
0
0
0
0
0
0
00
1
Figure 34-2. Main Configuration Register (MCR)
Table 34-2. MCR Field Descriptions
Field
OWREN
WLSIDE
MODE
EDGLEV
TRGEN
Description
Overwrite enable.
0 Conversion data is discarded.
1 Conversion data is overwritten by a newer result.
Write Left /Right aligned.
0 Conversion data is written right-aligned.
1 Conversion data is left-aligned (from 15 to (15 – resolution + 1)).
One Shot/Scan mode selection.
0 One Shot mode: configure the normal conversion of one chain.
1 Scan mode: configure continuous chain conversion mode. When the programmed chain conversion is
finished, the chain conversion restarts immediately.
Edge /Level selection for external start trigger.
0 Edge configuration for external trigger usage.
1 Level configuration for external trigger usage.
External trigger enable. This bit must be set to use external triggering to start a conversion.
0 An external trigger cannot be used to start a conversion.
1 An external trigger can start a conversion.
34-8
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor