TMS320VC5504 datasheet(107/128 Pages) TI

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6.15 Serial Port Interface (SPI)

6.15.1 SPI Peripheral Register Description(s)

TMS320VC5504

Fixed-Point Digital Signal Processor

www.ti.com

SPRS609A – JUNE 2009 – REVISED JULY 2009

The VC5504M serial port interface (SPI) is a high-speed synchronous serial input/output port that allows a

serial bit stream of programmed length (1 to 32 bits) to be shifted into and out of the device at a

programmed bit-transfer rate. The SPI supports multi-chip operation of up to four SPI slave devices. The

SPI can operate as a master device only, slave mode is not supported.

The SPI is normally used for communication between the DSP and external peripherals. Typical

applications include an interface to external I/O or peripheral expansion via devices such as shift registers,

display drivers, SPI EEPROMs, and analog-to-digital converters.

The SPI has the following features:

• Programmable divider for serial data clock generation

• Four pin interface (SPI_CLK, SPI_CSn, SPI_RX, and SPI_TX)

• Programmable data length (1 to 32 bits)

• 4 external chip select signals

• Programmable transfer or frame size (1 to 4096 characters)

• Optional interrupt generation on character completion

• Programmable SPI_CSn to SPI_TX delay from 0 to 3 SPI_CLK cycles

• Programmable signal polarities

• Programmable active clock edge

• Internal loopback mode for testing

Table 6-34 shows the SPI registers.

For more detailed information on the SPI peripheral, see the TMS320VC5505 Serial Port Interface (SPI)

User's Guide (literature number SPRUFO3).

Table 6-34. SPI Module Registers

CPU

WORD

ACRONYM

ADDRESS

3000h

SPICDR

Clock Divider Register

3001h

SPICCR

Clock Control Register

3002h

SPIDCR1

Device Configuration Register 1

3003h

SPIDCR2

Device Configuration Register 2

3004h

SPICMD1

Command Register 1

3005h

SPICMD2

Command Register 2

3006h

SPISTAT1

Status Register 1

3007h

SPISTAT2

Status Register 2

3008h

SPIDAT1

Data Register 1

3009h

SPIDAT2

Data Register 2

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