LM3S6918 Luminary Micro, Inc, LM3S6918 Datasheet - Page 459
LM3S6918
Manufacturer Part Number
LM3S6918
Description
Lm3s6918 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S6918.pdf
(539 pages)
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17.2.1
July 26, 2008
Table 17-2. Comparator 1 Operating Modes
a. C0o 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 17-3 on page 459. This is controlled by a
single configuration register (ACREFCTL). Table 17-3 on page 459 shows the programming options
to develop specific internal reference values, to compare an external voltage against a particular
voltage generated internally.
Figure 17-3. Comparator Internal Reference Structure
VREF
Table 17-3. 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+
C0o/C1+
reserved
RNG=X
Vref
C0+
Vref
a
8R
Output
C0o/C1+
C0o/C1+
Output
n/a
n/a
n/a
n/a
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
ADC Trigger
Decoder
ADC Trigger
yes
yes
yes
yes
yes
yes
R
1
R
0
8R
LM3S6918 Microcontroller
internal
reference
459
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