Specifications

20 DSP56800 Hardware Interface Techniques 

Peripheral Interfaces

Figure 18. Block Diagram of the SSI CODEC Interface

3.4 DAC Interface using SPI Port

The DSP56F807EVM board contains a serial 10-bit, 4-channel D/A converter connected to the

DSP56F807’s SPI port. The output pins are uncommitted and are connected to a 4X2 header, J1, to

allow easy user connections. Refer to Figure 19 for the D/A connections. The D/A’s output full-scale

range value can be set to a value from 0.0V to 2.4V by a trimpot, R1. This trimpot is preset to +2.05V,

which provides approximately 2mV per step.

Table 5: SSI CODEC Enable Connector Descriptor

Pin # DSP Signal Pin # CODEC Signal

1 STD/PC8 2 DR

3 SRD/PC9 4 DT

5 STCK/PC10 6 BCLKR/BCLKT/MCLK

7 STFS/PC11 8 FST/FSR

9 SRCK/PC12 10 NC

11 SRFS/PC13 12 NC

13 GND 14 GND

DSP56824

MC145483

CODEC Enable

(SSI Port Connector)

SRD

STD

STCK

STFS

SRCK

SRFS

BCLKR, BCLKT, MCLK

FST, FSR

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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