LM3S6918_16 Datasheet, PDF (470/694 Pages) Texas Instruments – Stellaris LM3S6918 Microcontroller

Synchronous Serial Interface (SSI)
13 Synchronous Serial Interface (SSI)
13.1
The Stellaris^® microcontroller includes two Synchronous Serial Interface (SSI) modules. Each SSI
is a master or slave interface for synchronous serial communication with peripheral devices that
have either Freescale SPI, MICROWIRE, or Texas Instruments synchronous serial interfaces.
Each Stellaris SSI module has the following features:
■ Two SSI modules, each with the following features:
■ Master or slave operation
■ Programmable clock bit rate and prescale
■ Separate transmit and receive FIFOs, 16 bits wide, 8 locations deep
■ Programmable interface operation for Freescale SPI, MICROWIRE, or Texas Instruments
synchronous serial interfaces
■ Programmable data frame size from 4 to 16 bits
■ Internal loopback test mode for diagnostic/debug testing
Block Diagram
Figure 13-1. SSI Module Block Diagram
Interrupt
Control/ Status
SSICR0
SSICR1
SSISR
Interrupt Control
SSIIM
SSIMIS
SSIRIS
SSIICR
SSIDR
System Clock
SSIPCellID 0
SSIPCellID 1
SSIPCellID 2
SSIPCellID 3
Identification
Registers
SSIPeriphID0 SSIPeriphID 4
SSIPeriphID1 SSIPeriphID 5
SSIPeriphID2 ^{SSIPeriphID 6}
SSIPeriphID 3 SSIPeriphID7
Clock
Prescaler
SSICPSR
TxFIFO
8 x16
.
.
.
RxFIFO
8 x16
.
.
.
SSITx
Transmit /
Receive
Logic
SSIRx
SSIClk
SSIFss
470
July 16, 2014
Texas Instruments-Production Data