Datasheet

■ Internal loopback test mode for diagnostic/debug testing
■ Standard FIFO-based interrupts and End-of-Transmission interrupt
■ Efficient transfers using Micro Direct Memory Access Controller (µDMA)
– Separate channels for transmit and receive
– Receive single request asserted when data is in the FIFO; burst request asserted when FIFO
contains 4 entries
– Transmit single request asserted when there is space in the FIFO; burst request asserted
when four or more entries are available to be written in the FIFO
– Maskable µDMA interrupts for receive and transmit complete
■ Global Alternate Clock (ALTCLK) resource or System Clock (SYSCLK) can be used to generate
baud clock.
1.3.9 System Integration
The TM4C129ENCPDT microcontroller provides a variety of standard system functions integrated
into the device, including:
■ Direct Memory Access Controller (DMA)
■ System control and clocks including on-chip precision 16-MHz oscillator
■ Eight 32-bit timers (each of which can be configured as two 16-bit timers)
■ Lower-power battery-backed Hibernation module
■ Real-Time Clock in Hibernation module
■ Two Watchdog Timers
– One timer runs off the main oscillator
– One timer runs off the precision internal oscillator
■ Up to 90 GPIOs, depending on configuration
– Highly flexible pin muxing allows use as GPIO or one of several peripheral functions
– Independently configurable to 2-, 4-, 8-, 10-, or 12-mA drive capability
– Up to 4 GPIOs can have 18-mA drive capability
The following sections provide more detail on each of these functions.
1.3.9.1 Direct Memory Access (see page 686)
The TM4C129ENCPDT microcontroller includes a Direct Memory Access (DMA) controller, known
as micro-DMA (μDMA). The μDMA controller provides a way to offload data transfer tasks from the
Cortex-M4F processor, allowing for more efficient use of the processor and the available bus
bandwidth. The μDMA controller can perform transfers between memory and peripherals. It has
dedicated channels for each supported on-chip module and can be programmed to automatically
perform transfers between peripherals and memory as the peripheral is ready to transfer more data.
The μDMA controller provides the following features:
■ ARM PrimeCell
®
32-channel configurable µDMA controller
73June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C129ENCPDT Microcontroller