LM3S1968 Datasheet, PDF (431/709 Pages) List of Unclassifed Manufacturers – Microcontroller

Stellaris^® LM3S1968 Microcontroller
Register 27: ADC Test Mode Loopback (ADCTMLB), offset 0x100
This register provides loopback operation within the digital logic of the ADC, which can be useful in
debugging software without having to provide actual analog stimulus. This test mode is entered by
writing a value of 0x0000.0001 to this register. When data is read from the FIFO in loopback mode,
the read-only portion of this register is returned.
ADC Test Mode Loopback (ADCTMLB)
Base 0x4003.8000
Offset 0x100
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
LB
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:1
0
Name
reserved
LB
Type
Reset Description
RO 0x0000.000 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
R/W
0
Loopback Mode Enable
When set, forces a loopback within the digital block to provide information
on input and unique numbering. The ADCSSFIFOn registers do not
provide sample data, but instead provide the 10-bit loopback data as
shown below.
Bit/Field Name
9:6
CNT
5
CONT
4
DIFF
3
TS
2:0
MUX
Description
Continuous Sample Counter
Continuous sample counter that is initialized to 0
and counts each sample as it processed. This
helps provide a unique value for the data received.
Continuation Sample Indicator
When set, indicates that this is a continuation
sample. For example, if two sequencers were to
run back-to-back, this indicates that the controller
kept continuously sampling at full rate.
Differential Sample Indicator
When set, indicates that this is a differential
sample.
Temp Sensor Sample Indicator
When set, indicates that this is a temperature
sensor sample.
Analog Input Indicator
Indicates which analog input is to be sampled.
July 15, 2014
431
Texas Instruments-Production Data