Texas Instruments TMS320DM36X Benutzerhandbuch
3.1
ADCTL
Registers
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The ADC control register (ADCTL) is shown in
and described in
.
Figure 2. ADC Control (ADCTL) Register
31
24
Reserved
R-0
23
16
Reserved
R-0
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
BUSY
CMPFLG
CMPIEN
CMPMD
SCNFLG
SCNIEN
SCNMD
START
R-0
R/C-0
R/W-0
R/W-0
R/C-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 2. ADC Control (ADCTL) Field Descriptions
Bit
Field
Value
Description
31-8
Reserved
Any writes to these bit(s) must always have a value of 0.
7
BUSY
Busy flag
6
CMPFLG
Comparator interrupt flag clear bit. Writing ‘1’ into this bit clears the comparator interrupt flag and
then it will be cleared automatically. At read time, comparator interrupt status can be read.
then it will be cleared automatically. At read time, comparator interrupt status can be read.
0
No interrupt
1
Interrupt
5
CMPIEN
Comparator interrupt enable bit
0
Disable
1
Enable
4
CMPMD
Comparator mode select bit
0
If the value of A/D input data is larger or smaller than the comparative data, a comparator interrupt
is generated. ADC input data < CMPLDAT or ADC input data > CMPUDAT
is generated. ADC input data < CMPLDAT or ADC input data > CMPUDAT
1
If the value of A/D input data is within the range of the comparative data, a comparator interrupt is
generated. CMPLDAT
generated. CMPLDAT
≤
ADC input data
≤
CMPUDAT
3
SCNFLG
Scan interrupt flag clear bit. Writing '1' into this bit clears the scan interrupt flag then it will be
cleared automatically. At read time, scan interrupt status can be read.
cleared automatically. At read time, scan interrupt status can be read.
0
No interrupt
1
Interrupt
2
SCNIEN
Scan interrupt enable bit
0
Disable
1
Enable
1
SCNMD
Scan mode selection
0
One shot
1
Free run
0
START
A/D conversion start bit The status is cleared automatically when A/D conversion in One-Shot mode
terminates. Writing '0' into this bit in Free-Run mode terminates A/D conversion.'0' can be read at
the time of read-access if no analog channel is selected on the CHSEL register. ('1' can be read
only at the time of A/D conversion.)
terminates. Writing '0' into this bit in Free-Run mode terminates A/D conversion.'0' can be read at
the time of read-access if no analog channel is selected on the CHSEL register. ('1' can be read
only at the time of A/D conversion.)
Analog to Digital Converter (ADC) Interface
12
SPRUFI7 – March 2009