1.3.5.6 QSSI (see page 1226)
Quad Synchronous Serial Interface (QSSI) is a bi-directional communications interface that converts
data between parallel and serial. The QSSI module performs serial-to-parallel conversion on data
received from a peripheral device, and parallel-to-serial conversion on data transmitted to a peripheral
device. The QSSI module can be configured as either a master or slave device. As a slave device,
the QSSI module can also be configured to disable its output, which allows a master device to be
coupled with multiple slave devices. The TX and RX paths are buffered with separate internal FIFOs.
The QSSI module also includes a programmable bit rate clock divider and prescaler to generate
the output serial clock derived from the QSSI module's input clock. Bit rates are generated based
on the input clock and the maximum bit rate is determined by the connected peripheral.
The TM4C1294NCPDT microcontroller includes four QSSI modules with the following features:
■ Four QSSI channels with Advanced, Bi- and Quad-SSI functionality
■ Programmable interface operation for Freescale SPI or Texas Instruments synchronous serial
interfaces in Legacy Mode. Support for Freescale interface in Bi- and Quad-SSI mode.
■ Master or slave operation
■ Programmable clock bit rate and prescaler
■ Separate transmit and receive FIFOs, each 16 bits wide and 8 locations deep
■ Programmable data frame size from 4 to 16 bits
■ 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.
1.3.6 System Integration
The TM4C1294NCPDT 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)
67June 18, 2014
Texas Instruments-Production Data
Tiva
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TM4C1294NCPDT Microcontroller
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