PXS20RM Datasheet, PDF (165/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Analog-to-Digital Converter (ADC)
Address: Base + 0x004
Access: User read-only
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0000000
00
00
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
CHADDR
000
00
ADCSTATUS
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Figure 9-2. Main Status Register (MSR)
Table 9-4. MSR field descriptions
Field
NSTART
JABORT
JSTART
REF_RANGE
CTUSTART
CHADDR
ACKO
ADCSTATUS
Description
This status bit is used to signal that a normal conversion is ongoing.
This status bit is used to signal that an injected conversion has been aborted. This bit is reset
when a new injected conversion starts.
This status bit is used to signal that an injected conversion is ongoing.
This bit defines the voltage range for operation of the ADC. It is provided as an output by the ADC,
along with data, after every conversion.
0 Reference voltage is less than or equal to 3.6 V
1 Reference voltage is greater than 4.5 V
Note: If the reference voltage is outside of the ranges specified here, the value of REF_RANGE
can be 0 or 1 depending on the supply, process, and temperature.
This status bit is used to signal that a CTU conversion is ongoing. This bit is set when a CTU
trigger pulse is received and the CTU conversion starts. When CTU trigger mode is enabled this
bit is automatically reset when the conversion is completed. Otherwise, if Control Mode is
enabled this bit is reset when the CTU is disabled (CTUEN set to ‘0’).
Channel under measure address
This status bit is used to signal which channel is under measure.
Auto-clock-off enable
This status bit is used to signal if the Auto-clock-off feature is on.
The value of this parameter depends on ADC status:
000 Idle
001 Power-down
010 Wait state
011 —
100 Sample
101 —
110 Conversion
111 —
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
9-7