Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
Register 44: PWM0 Generator A Control (PWM0GENA), offset 0x060
Register 45: PWM1 Generator A Control (PWM1GENA), offset 0x0A0
Register 46: PWM2 Generator A Control (PWM2GENA), offset 0x0E0
Register 47: PWM3 Generator A Control (PWM3GENA), offset 0x120
These registers control the generation of the pwmA 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
(PWM0GENA controls the PWM generator 0 block, and so on). 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 resulting PWM
signal.
from the counter, as well as the compare A and compare B pulses from the comparators
(PWM0GENA controls the PWM generator 0 block, and so on). 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 resulting PWM
signal.
The PWM0GENA register controls generation of the pwm0A signal; PWM1GENA, the pwm1A
signal; PWM2GENA, the pwm2A signal; and PWM3GENA, the pwm3A signal.
signal; PWM2GENA, the pwm2A signal; and PWM3GENA, the pwm3A 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.
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.
If the Generator A update mode is immediate (based on the
GENAUPD
field encoding in the PWMnCTL
register), the
ACTCMPBD
,
ACTCMPBU
,
ACTCMPAD
,
ACTCMPAU
,
ACTLOAD
, and
ACTZERO
values are
used immediately. If the update mode is locally synchronized, these values are used the next time
the counter reaches zero. If the update mode is globally synchronized, these values are used the
next time the counter reaches zero after a synchronous update has been requested through the
PWM Master Control (PWMCTL) register (see page 1945). If this register is rewritten before the
actual update occurs, the previous value is never used and is lost.
the counter reaches zero. If the update mode is globally synchronized, these values are used the
next time the counter reaches zero after a synchronous update has been requested through the
PWM Master Control (PWMCTL) register (see page 1945). If this register is rewritten before the
actual update occurs, the previous value is never used and is lost.
PWMn Generator A Control (PWMnGENA)
PWM0 base: 0x4002.8000
Offset 0x060
Type RW, reset 0x0000.0000
Offset 0x060
Type RW, reset 0x0000.0000
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
reserved
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
ACTZERO
ACTLOAD
ACTCMPAU
ACTCMPAD
ACTCMPBU
ACTCMPBD
reserved
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RO
RO
RO
RO
Type
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
Description
Reset
Type
Name
Bit/Field
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0000.0
RO
reserved
31:12
December 13, 2013
1986
Texas Instruments-Advance Information
Pulse Width Modulator (PWM)