The SSI module includes the following features:
- Programmable interface operation for
Freescale® SPI, or Texas Instruments Synchronous Serial Interfaces. In this SSI module, only the Legacy SSI mode is supported.
- 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 and 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 four entries
- Transmit single request asserted when there is space in the FIFO; burst request asserted when FIFO contains four or more entries are available to be written in the FIFO
- Maskable μDMA interrupts for receive and transmit complete