Datasheet

– On-chip fixed Low Drop-Out (LDO) voltage regulator
– Hibernation module handles the power-up/down 3.3 V sequencing and control for the core
digital logic and analog circuits
– Low-power options for microcontroller: Sleep and Deep-Sleep modes with clock gating
– Low-power options for on-chip modules: software controls shutdown of individual peripherals
and memory
– 3.3-V supply brown-out detection and reporting via interrupt or reset
■ Multiple clock sources for microcontroller system clock. The TM4C129ENCPDT microcontroller
is clocked by the system clock (SYSCLK) that is distributed to the processor and integrated
peripherals after clock gating. The SYSCLK frequency is based on the frequency of the clock
source and a divisor factor. A PLL is provided for the generation of system clock frequencies in
excess of the reference clock provided. The reference clocks for the PLL are the PIOSC and the
main crystal oscillator. The following clock sources are provided to the TM4C129ENCPDT
microcontroller:
– 16-MHz Precision Oscillator (PIOSC)
– Main Oscillator (MOSC): A frequency-accurate clock source by one of two means: an external
single-ended clock source is connected to the OSC0 input pin, or an external crystal is
connected across the OSC0 input and OSC1 output pins.
– Low Frequency Internal Oscillator (LFIOSC): On-chip resource used during power-saving
modes
– Hibernate RTC oscillator (RTCOSC) clock that can be configured to be the 32.768-kHz
external oscillator source from the Hibernation (HIB) module or the HIB Low Frequency clock
source (HIB LFIOSC), which is located within the Hibernation Module.
■ Flexible reset sources
– Power-on reset (POR)
– Reset pin assertion
– Brown-out reset (BOR) detector alerts to system power drops
– Software reset
– Watchdog timer reset
– Hibernation module event
– MOSC failure
■ 128-bit unique identifier for individual device identification
1.3.9.3 Programmable Timers (see page 1079)
Programmable timers can be used to count or time external events that drive the Timer input pins.
Each 16/32-bit GPTM block provides two 16-bit timers/counters that can be configured to operate
independently as timers or event counters, or configured to operate as one 32-bit timer or one 32-bit
75June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C129ENCPDT Microcontroller