LM3S9B81 Datasheet, PDF (636/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Synchronous Serial Interface (SSI)
15.1 Block Diagram
Figure 15-1. SSI Module Block Diagram
DMA Request
DMA Control
SSIDMACTL
Interrupt
Interrupt Control
Control/Status
SSIIM
SSIMIS
SSIRIS
SSIICR
SSICR0
SSICR1
SSISR
SSIDR
System Clock
Clock Prescaler
SSICPSR
TxFIFO
8 x 16
.
.
.
RxFIFO
8 x 16
.
.
.
SSITx
Transmit/
Receive
Logic
SSIRx
SSIClk
SSIFss
15.2
Identification Registers
SSIPCellID0
SSIPCellID1
SSIPCellID2
SSIPCellID3
SSIPeriphID0
SSIPeriphID1
SSIPeriphID2
SSIPeriphID3
SSIPeriphID4
SSIPeriphID5
SSIPeriphID6
SSIPeriphID7
Signal Description
Table 15-1 on page 637 and Table 15-2 on page 637 list the external signals of the SSI module and
describe the function of each. The SSI signals are alternate functions for some GPIO signals and
default to be GPIO signals at reset., with the exception of the SSI0Clk, SSI0Fss, SSI0Rx, and
SSI0Tx pins which default to the SSI function. The column in the table below titled "Pin Mux/Pin
Assignment" lists the possible GPIO pin placements for the SSI signals. The AFSEL bit in the GPIO
Alternate Function Select (GPIOAFSEL) register (page 318) should be set to choose the SSI
636
June 29, 2010
Texas Instruments-Advance Information