LM3S317 Datasheet, PDF (340/379 Pages) List of Unclassifed Manufacturers – Microcontroller

Pulse Width Modulator (PWM)
Register 16: PWM0 Compare A (PWM0CMPA), offset 0x058
contain a value to be compared against the counter. When this value matches the counter, a
pulse is output; this can drive the generation of a PWM signal (via the PWMnGENA/PWMnGENB
registers) or drive an interrupt (via the PWMnINTEN register). If the value of this register is greater
than the PWMnLOAD register (see page 338), then no pulse is ever output.
For comparator A, if the update mode is immediate (based on the CmpAUpd bit in the PWMnCTL
register), then this 16-bit CompA value is used the next time the counter reaches zero. If the update
mode is synchronous, it is used the next time the counter reaches zero after a synchronous
update has been requested through the PWM Master Control (PWMCTL) register (see
page 325). If this register is rewritten before the actual update occurs, the previous value is never
used and is lost.
PWMn Compare A (PWMnCMPA)
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CompA
Type R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:16
15:0
Name
reserved
CompA
Type
RO
R/W
Reset
0
0
Description
Reserved bits return an indeterminate value, and should
never be changed.
The value to be compared against the counter.
340
May 4, 2007
Preliminary