LM3S308 Luminary Micro, Inc, LM3S308 Datasheet - Page 255

• Manufacturer Part Number: LM3S308
• Description: Lm3s308 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
ADC Test Mode Loopback (ADCTMLB)
Base 0x4003.8000
Offset 0x100
Type R/W, reset 0x0000.0000
June 04, 2008
Bit/Field
31:1
RO
RO
0
31
15
0
0
RO
RO
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.
30
14
0
0
RO
RO
29
13
reserved
0
0
Name
LB
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
RO
RO
RO
26
10
0
0
RO
RO
Reset
25
0x00
0
9
0
0
reserved
Preliminary
RO
RO
24
0
8
0
reserved
Description
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.
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
9:6
5
4
3
2:0
RO
RO
23
0
7
0
Name
CNT
CONT
DIFF
TS
MUX
RO
RO
22
0
6
0
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.
RO
RO
21
0
5
0
RO
RO
20
0
4
0
RO
RO
19
0
3
0
LM3S308 Microcontroller
RO
RO
18
0
2
0
RO
RO
17
0
1
0
R/W
RO
LB
16
0
0
0
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