DSP56303 datasheet(178/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

8-10

Freescale Semiconductor

Serial Communication Interface (SCI)

8.6.1 SCI Control Register (SCR)

The SCR is a read/write register that controls the serial interface operation.

Figure 8-2. SCI Data Word Formats (SSFTD = 0), 2

Mode 0

8-bit Synchronous Data (Shift Register Mode)

(SSFTD = 0)

One Byte From Shift Register

Mode 2

10-bit Asynchronous (1 Start, 8 Data, 1 Stop)

(SSFTD = 0)

D7 or

Data

Type

Stop

Bit

Mode 4

11-bit Asynchronous (1 Start, 8 Data, 1 Even Parity, 1 Stop)

(SSFTD = 0)

D7 or

Data

Type

Stop

Bit

Even

Parity

Mode 5

11-bit Asynchronous (1 Start, 8 Data, 1 Odd Parity, 1 Stop)

(SSFTD = 0)

Start

Bit

D7 or

Data

Type

Stop

Bit

Odd

Parity

Mode 6

11-bit Asynchronous Multidrop (1 Start, 8 Data, 1 Data Type, 1 Stop)

(SSFTD = 0)

Start

Bit

Stop

Bit

Data

Type

• Modes 1, 3, and 7 are reserved.

• D0 = LSB; D7 = MSB.

• Data is transmitted and received LSB first if SSFTD = 0,

or MSB first if SSFTD = 1.

WDS2 WDS1 WDS0

Start

Bit

WDS2 WDS1 WDS0

Start

Bit

WDS2 WDS1 WDS0

0 = Data Byte

Data Type: 1 = Address Byte

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