SN250 datasheet(72/130 Pages) STMICROELECTRONICS

72 / 130 page

Functional description—application modules

SN250

72/130

When the slave select (nSSEL) signal is asserted (by the Master), SC2 SPI transmit data is

driven to the output pin MISO and SC2 SPI data is received from the input pin MOSI. The

slave select signal nSSEL is used to enable driving the serialized data output signal MISO.

It is also used to reset the SC2 SPI slave shift register.

Characters received and transmitted are passed through receive and transmit FIFOs. The

transmit and receive FIFOs are 4 bytes deep. These FIFOs are accessed under software

control by accessing the SC2_DATA data register or under hardware control using a DMA

controller.

Any character received is stored in the (empty) receive FIFO. The register bit

SC_SPIRXVAL

in the SC2_SPISTAT register is set to indicate that not all received

characters are read out from receive FIFO. If software or DMA is not reading from the

receive FIFO, the receive FIFO will store up to 4 characters. Any further reception is

dropped, and the register bit SC_SPIRXOVF in the SC2_SPISTAT register is set. The RX

Table 25.

SC2 SPI slave formats

SC2_SPICFG

Frame Format

20000

SC2-4S

mode

20001

SC2-4S

mode

20010

SC2-4S

mode

20011

SC2-4S

mode

201

SC2-4S

mode

Same as above except LSB first instead of MSB first

SC2-

mode

Illegal

SC2-2

mode

Illegal

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