TM4C123GH6PZ Datasheet, PDF (332/1446 Pages) Texas Instruments – Tiva Microcontroller

System Control
Register 54: Pulse Width Modulator Software Reset (SRPWM), offset 0x540
The SRPWM register provides software the capability to reset the available PWM modules. This
register provides the same capability as the legacy Software Reset Control n SRCRn registers
specifically for the PWM modules and has the same bit polarity as the corresponding SRCRn bits.
A peripheral is reset by software using a simple two-step process:
1. Software sets a bit (or bits) in the SRPWM register. While the SRPWM bit is 1, the peripheral
is held in reset.
2. Software completes the reset process by clearing the SRPWM bit.
There may be latency from the clearing of the SRPWM bit to when the peripheral is ready for use.
Software can check the corresponding PRPWM bit to be sure.
Important: This register should be used to reset the PWM modules. To support legacy software,
the SRCR0 register is available. Setting the PWM bit in the SRCR0 register also resets
the PWM0 module. If the PWM bit is changed by writing to the SRCR0 register, it can
be read back correctly when reading the SRCR0 register. Software must use this register
to reset PWM1, which is not present in the legacy registers. If software uses this register
to reset PWM0, the write causes proper operation, but the value of that bit is not reflected
in the SRCR0 register. If software uses both legacy and peripheral-specific register
accesses, the peripheral-specific registers must be accessed by read-modify-write
operations that affect only peripherals that are not present in the legacy registers. In
this manner, both the peripheral-specific and legacy registers have coherent information.
Pulse Width Modulator Software Reset (SRPWM)
Base 0x400F.E000
Offset 0x540
Type RW, reset 0x0000.0000
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
reserved
R1
R0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:2
1
Name
reserved
R1
Type
RO
RW
Reset
0
0
Description
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.
PWM Module 1 Software Reset
Value Description
0 PWM module 1 is not reset.
1 PWM module 1 is reset.
332
June 12, 2014
Texas Instruments-Production Data