RM0319 datasheet(238/368 Pages) STMICROELECTRONICS

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Synchronous serial ports (SSP)

RM0319

238/368

Doc ID 022640 Rev 3

18.4

Functional description

Figure 86 shows the block diagram of the SSP controller.

Figure 86.

SSP block diagram

18.4.1

APB slave interface

The AMBA APB interface generates read and write decodes for accesses to status and

control registers, and transmit and receive FIFO memories.

18.4.2

The register block stores data written or to be read across the AMBA APB interface.

SSP1_SS0

Slave select (chip-select)

Out

Slave select (chip-select)

SSP2_MOSI

Transmit Data

Out

Receive Data

SSP2_MISO

Receive Data

Transmit Data

Out

SSP2_CLK

Clock

Out

Clock

SSP2_SS0

Slave select (chip-select)

Out

Slave select (chip-select)

Table 68.

SSP pin description

SSP Port

SSP in master mode

SSP in slave mode

Function

Direction

Function

Direction

AMBA APB

I/F

Tx FIFO

(8x16)

Rx FIFO

(8x16)

Block

DMA

interface

Clock

Prescaler

Transmit/

Receive

logic

FIFO Status

And

Interrupt

Generation

IRQ

SPI BUS

PCLK

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