LM3S301 Luminary Micro, Inc, LM3S301 Datasheet - Page 334
LM3S301
Manufacturer Part Number
LM3S301
Description
Lm3s301 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S301.pdf
(366 pages)
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Pulse Width Modulator (PWM)
334
Reset
Reset
Type
Type
Bit Field
PWMn Generator A Control (PWMnGENA)
31:12
11:10
RO
RO
31
15
0
0
9:8
7:6
5:4
3:2
1:0
Register 18: PWM0 Generator A Control (PWM0GENA), offset 0x060
This register controls the generation of the PWMnA signal based on the load and zero output pulses
from the counter, as well as the compare A and compare B pulses from the comparators. When
the counter is running in Count-Down mode, only four of these events occur; when running in
Count-Up/Down mode, all six occur. These events provide great flexibility in the positioning and
duty cycle of the PWM signal that is produced.
The PWM0GENA register controls generation of the PWM0A signal.
Each field can take on one of the values defined in Table 15-2, which defines the effect of the
event on the output signal.
If a zero or load event coincides with a compare A or compare B event, the zero or load action is
taken and the compare A or compare B action is ignored. If a compare A event coincides with a
compare B event, the compare A action is taken and the compare B action is ignored.
RO
RO
30
14
0
0
reserved
ActCmpBD
ActCmpBU
ActCmpAD
ActCmpAU
reserved
ActLoad
ActZero
Name
RO
RO
29
13
0
0
RO
RO
28
12
0
0
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
27
11
ActCmpBD
0
0
R/W
RO
26
10
0
0
Reset
R/W
RO
25
ActCmpBU
0
9
0
0
0
0
0
0
0
0
Preliminary
R/W
RO
24
0
8
0
reserved
Description
Reserved bits return an indeterminate value, and should
never be changed.
The action to be taken when the counter matches
comparator B while counting down.
The action to be taken when the counter matches
comparator B while counting up. Occurs only when the
Mode bit in the PWMnCTL register (see page 325) is set
to 1.
The action to be taken when the counter matches
comparator A while counting down.
The action to be taken when the counter matches
comparator A while counting up.Occurs only when the
Mode bit in the PWMnCTL register is set to 1.
The action to be taken when the counter matches the load
value.
The action to be taken when the counter is zero.
R/W
RO
23
ActCmpAD
0
7
0
R/W
RO
22
0
6
0
R/W
RO
21
ActCmpAU
0
5
0
R/W
RO
20
0
4
0
R/W
RO
19
0
3
0
ActLoad
R/W
RO
18
0
2
0
R/W
RO
17
July 5, 2006
0
1
0
ActZero
R/W
RO
16
0
0
0
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