TM4C1233D5PZ Datasheet, PDF (449/1242 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1233D5PZ Microcontroller
Register 127: Sleep Mode Clock Gating Control Register 0 (SCGC0), offset
0x110
This register controls the clock gating logic in Sleep mode. Each bit controls a clock enable for a
given interface, function, or module. If set, the module receives a clock and functions. Otherwise,
the module is unclocked and disabled (saving power). If the module is unclocked, reads or writes
to the module generate a bus fault. The reset state of these bits is 0 (unclocked) unless otherwise
noted, so that all functional modules are disabled. It is the responsibility of software to enable the
ports necessary for the application. Note that these registers may contain more bits than there are
interfaces, functions, or modules to control. This configuration is implemented to assure reasonable
code compatibility with other family and future parts. RCGC0 is the clock configuration register for
running operation, SCGC0 for Sleep operation, and DCGC0 for Deep-Sleep operation. Setting the
ACG bit in the Run-Mode Clock Configuration (RCC) register specifies that the system uses sleep
modes.
Important: This register is provided for legacy software support only.
The peripheral-specific Sleep Mode Clock Gating Control registers (such as SCGCWD)
should be used to reset specific peripherals. A write to this legacy register also writes
the corresponding bit in the peripheral-specific register. Any bits that are changed by
writing to this register can be read back correctly with a read of this register. Software
must use the peripheral-specific registers to support modules that are not present in
the legacy registers. If software uses a peripheral-specific register to write a legacy
peripheral (such as Watchdog 1), the write causes proper operation, but the value of
that bit is not reflected in this 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.
Sleep Mode Clock Gating Control Register 0 (SCGC0)
Base 0x400F.E000
Offset 0x110
Type RO, reset 0x0000.0040
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
WDT1
reserved
CAN0
reserved
ADC1 ADC0
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
HIB
reserved
WDT0
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
1
0
0
0
0
0
0
Bit/Field
31:29
28
Name
reserved
WDT1
Type
RO
RO
Reset
0
0x0
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.
WDT1 Clock Gating Control
This bit controls the clock gating for Watchdog Timer module 1. If set,
the module receives a clock and functions. Otherwise, the module is
unclocked and disabled. If the module is unclocked, a read or write to
the module generates a bus fault.
June 12, 2014
449
Texas Instruments-Production Data