LM3S6422 Luminary Micro, Inc, LM3S6422 Datasheet - Page 399
LM3S6422
Manufacturer Part Number
LM3S6422
Description
Lm3s6422 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S6422.pdf
(473 pages)
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15.2.1
July 25, 2008
Table 15-2. Comparator 1 Operating Modes
a. C1o and C1+ signals share a single pin and may only be used as one or the other.
Internal Reference Programming
The structure of the internal reference is shown in Figure 15-3 on page 399. This is controlled by a
single configuration register (ACREFCTL). Table 15-3 on page 399 shows the programming options
to develop specific internal reference values, to compare an external voltage against a particular
voltage generated internally.
Figure 15-3. Comparator Internal Reference Structure
VREF
Table 15-3. Internal Reference Voltage and ACREFCTL Field Values
ACCNTL0
ASRCP
10
11
ACCNTL1
ASRCP
00
01
10
11
ACREFCTL Register
EN Bit Value
RNG
EN
EN=0
Comparator 0
VIN-
Comparator 1
VIN-
C0-
C0-
C1-
C1-
C1-
C1-
AVDD
RNG Bit Value
VIN+
reserved
VIN+
C1o/C1+
reserved
RNG=X
Vref
C0+
Vref
a
8R
Output
Output
C1o/C1+
C1o/C1+
C1o/C1+
C1o/C1+
C0o
C0o
Output Reference Voltage Based on VREF Field Value
0 V (GND) for any value of VREF; however, it is recommended that RNG=1 and VREF=0
for the least noisy ground reference.
15
Interrupt
R
Interrupt
yes
yes
yes
yes
yes
yes
14
Preliminary
ADCTrigger
Decoder
ADCTrigger
yes
yes
R
yes
yes
yes
yes
1
R
0
8R
LM3S6422 Microcontroller
internal
reference
399
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