TM4C123AE6PM Datasheet, PDF (303/1237 Pages) Texas Instruments – Tiva TM4C123AE6PM Microcontroller

Tiva^™ TM4C123AE6PM Microcontroller
Register 44: Micro Direct Memory Access Software Reset (SRDMA), offset
0x50C
The SRDMA register provides software the capability to reset the available μDMA module. This
register provides the same capability as the legacy Software Reset Control n SRCRn registers
specifically for the μDMA module 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 SRDMA register. While the SRDMA bit is 1, the peripheral is
held in reset.
2. Software completes the reset process by clearing the SRDMA bit.
There may be latency from the clearing of the SRDMA bit to when the peripheral is ready for use.
Software can check the corresponding PRDMA bit to be sure.
Important: This register should be used to reset the μDMA module. To support legacy software,
the SRCR2 register is available. Setting the UDMA bit in the SRCR2 register also resets
the μDMA module. If the UDMA bit is set by writing to the SRCR2 register, it can be read
back correctly when reading the SRCR2 register. If software uses this register to reset
the μDMA module, the write causes proper operation, but the value of the UDMA bit is
not reflected in the SRCR2 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.
Micro Direct Memory Access Software Reset (SRDMA)
Base 0x400F.E000
Offset 0x50C
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
R0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:1
0
Name
reserved
R0
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.
μDMA Module Software Reset
Value Description
0 μDMA module is not reset.
1 μDMA module is reset.
June 12, 2014
303
Texas Instruments-Production Data