DSP56857 datasheet(244/662 Pages) FREESCALE

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Functional Description

5685X Digital Signal Controller User Manual, Rev. 4

10-8

Freescale Semiconductor

10.6.3 SCI Transmitter Block Diagram

Figure 10-4. SCI Transmitter Block Diagram

10.6.3.1 Character Length

The SCI transmitter can accommodate either 8- or 9-bit data characters. The state of the M bit in

the SCI Control Register (SCICR) determines the length of data characters.

10.6.3.2 Character Transmission

During an SCI transmission, the Transmit Shift Register shifts a frame out to the TXD pin. The

data is written through the SCI data register.

To initiate an SCI transmission:

1. Enable the transmitter by writing a Logic 1 to the Transmitter Enable (TE) bit in the SCI

Control Register (SCICR).

876543210L

11-Bit Transmit Shift Register

TIDLE

TIIE

TEIE

SBK

TDRE

Parity

Generation

SCI Data Register

Transmitter Control

INTERNAL BUS

SBR12–SBR0

Baud Divider

÷ 16

TXD

TIDLE INTERRUPT REQUEST

TDRE INTERRUPT REQUEST

Module

Loop

LOOP

RSRC

Clock

Control

Receiver

POL

TDE

TDMA REQUEST

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