Datasheet

5.2.1 Device Identification
Read-only registers in the system control module provide information about the microcontroller,
such as version, part number, pin count, operating temperature range and available peripherals on
the device. The Device Identification 0 (DID0) (page 266) and Device Identification 1 (DID1)
(page 268) registers provide details about the device's version, package, temperature range, and so
on. The Peripheral Present registers starting at system control offset 0x300, such as the Watchdog
Timer Peripheral Present (PPWD) register, provide information on how many of each type of
module are included on the device. Finally, information about the capabilities of the on-chip
peripherals are provided at offset 0xFC0 in each peripheral's register space in the Peripheral
Properties registers, such as the GPTM Peripheral Properties (GPTMPP).
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 Reset Sources
The TM4C129XNCZAD microcontroller has the following reset sources:
1. Power-on reset (POR) (see page 232).
2. External reset input pin (RST) assertion (see page 233).
3. A brown-out detection of V
DDA
(analog voltage source) or V
DD
(external voltage source) dropping
below its acceptable operating range. (see page 235).
4. Software-initiated reset (with the software reset registers) (see page 236).
5. A watchdog timer reset condition violation (see page 236).
6. Hibernation module event
7. A software restart initiated through a Hardware System Service Request (HSSR)
8. MOSC failure (see page 239).
Table 5-2 provides a summary of results of the various reset operations. Note that the external RST
pin, the Brown-out detection unit, the HIB module and watchdog timer can all be programmed to
generate either a Power-On Reset (POR) or system reset depending on how the Reset Behavior
Control (RESBEHAVCTL) register at offset 0x1D8 is programmed.
Table 5-2. Reset Sources
On-Chip Peripherals Reset?JTAG Reset?Core Reset?Reset Source
YesYesYesExternally Generated
Power-On Reset
YesPin Configuration OnlyYesRST pin Power-On Reset
YesPin Configuration OnlyYesRST pin System Reset
YesPin Configuration OnlyYesBrown-Out Power-On Reset
YesPin Configuration OnlyYesBrown-Out System Reset
231December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller