LM3S301 Luminary Micro, Inc, LM3S301 Datasheet - Page 336
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)
336
Reset
Reset
Type
Type
Bit Field
PWMn Generator B Control (PWMnGENB)
31:12
11:10
RO
RO
31
15
0
0
9:8
7:6
5:4
3:2
1:0
Register 19: PWM0 Generator B Control (PWM0GENB), offset 0x064
This register controls the generation of the PWMnB 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 Down mode, only four of these events occur; when running in 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 PWM0GENB register controls generation of the PWM0B signal.
Each field can take on one of the values defined in Table 15-2 on page 335, 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 B action is taken and the compare A 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 0.
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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