TM4C1237E6PM Datasheet, PDF (314/1277 Pages) Texas Instruments – Tiva Microcontroller

System Control
Register 48: Synchronous Serial Interface Software Reset (SRSSI), offset
0x51C
The SRSSI register provides software the capability to reset the available SSI modules. This register
provides the same capability as the legacy Software Reset Control n SRCRn registers specifically
for the SSI 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 SRSSI register. While the SRSSI bit is 1, the peripheral is
held in reset.
2. Software completes the reset process by clearing the SRSSI bit.
There may be latency from the clearing of the SRSSI bit to when the peripheral is ready for use.
Software can check the corresponding PRSSI bit to be sure.
Important: This register should be used to reset the SSI modules. To support legacy software, the
SRCR1 register is available. Setting a bit in the SRCR1 register also resets the
corresponding module. Any bits that are changed by writing to the SRCR1 register can
be read back correctly when reading the SRCR1 register. Software must use this register
to reset modules that are not present in the legacy registers. If software uses this register
to reset a legacy peripheral (such as SSI0), the write causes proper operation, but the
value of that bit is not reflected in the SRCR1 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.
Synchronous Serial Interface Software Reset (SRSSI)
Base 0x400F.E000
Offset 0x51C
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
R3
R2
R1
R0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:4
3
Name
reserved
R3
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.
SSI Module 3 Software Reset
Value Description
0 SSI module 3 is not reset.
1 SSI module 3 is reset.
314
June 12, 2014
Texas Instruments-Production Data