■ Design optimizations for improved bus access performance between µDMA controller and the
processor core
– µDMA controller access is subordinate to core access
– RAM striping
– Peripheral bus segmentation
■ Data sizes of 8, 16, and 32 bits
■ Transfer size is programmable in binary steps from 1 to 1024
■ Source and destination address increment size of byte, half-word, word, or no increment
■ Maskable peripheral requests
■ Interrupt on transfer completion, with a separate interrupt per channel
1.3.6.2 System Control and Clocks (see page 220)
System control determines the overall operation of the device. It provides information about the
device, controls power-saving features, controls the clocking of the device and individual peripherals,
and handles reset detection and reporting.
■ Device identification information: version, part number, SRAM size, Flash memory size, and so
on
■ Power control
– 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 TM4C1294NCPDT 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 TM4C1294NCPDT
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.
69June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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