5.2 Functional Description
The System Control module provides the following capabilities:
■ Device identification, see “Device Identification” on page 176
■ Local control, such as reset (see “Reset Control” on page 176), power (see “Power
Control” on page 182) and clock control (see “Clock Control” on page 182)
■ System control (Run, Sleep, and Deep-Sleep modes), see “System Control” on page 189
5.2.1 Device Identification
Several read-only registers provide software with information on the microcontroller, such as version,
part number, SRAM size, Flash memory size, and other features. See the DID0 (page 194), DID1
(page 221), DC0-DC9 (page 223) and NVMSTAT (page 245) registers.
5.2.2 Reset Control
This section discusses aspects of hardware functions during reset as well as system software
requirements following the reset sequence.
5.2.2.1 CMOD0 and CMOD1 Test-Mode Control Pins
Two pins, CMOD0 and CMOD1, are defined for internal use for testing the microcontroller during
manufacture. They have no end-user function and should not be used. The CMOD pins should be
connected to ground.
5.2.2.2 Reset Sources
The LM3S6G65 microcontroller has six sources of reset:
1. Power-on reset (POR) (see page 177).
2. External reset input pin (RST) assertion (see page 178).
3. Internal brown-out (BOR) detector (see page 179).
4. Software-initiated reset (with the software reset registers) (see page 180).
5. A watchdog timer reset condition violation (see page 180).
6. MOSC failure (see page 181).
Table 5-3 provides a summary of results of the various reset operations.
Table 5-3. Reset Sources
On-Chip Peripherals Reset?JTAG Reset?Core Reset?Reset Source
YesYesYesPower-On Reset
YesYesYesRST
YesYesYesBrown-Out Reset
YesYesYesSoftware System Request
Reset using the SYSRESREQ
bit in the APINT register.
July 24, 2012176
Texas Instruments-Production Data
System Control
OBSOLETE: TI has discontinued production of this device.
