DSP56857 datasheet(240/662 Pages) FREESCALE

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Block Diagram

5685X Digital Signal Controller User Manual, Rev. 4

10-4

Freescale Semiconductor

10.3 Block Diagram

Figure 10-1. SCI Block Diagram

10.4 External Pin Descriptions

10.4.1 Transmit Data (TXD) Pin

The Transmit Data (TXD) pin is the SCI transmitter pin. TXD is available for general- purpose

I/O when it is not configured for transmitter operation, such as TE = 0.

10.4.2 Receiver Data (RXD) Pin

The Receiver Data (RXD) pin is the SCI receiver pin. RXD is available for general- purpose I/O

when it is not configured for receiver operation, such as RE = 0.

Data in Table 10-1 are external I/O signals for the chip interface.

Table 10-1. External I/O Signals

Signal Name

I/O Type

Description

Reset State

TXD

Output

Transmit Data Pin

RXD

Input

Receiver Data Pin

—

SCI Data

Receive

Shift Register

SCI Data

Transmit

Shift Register

Baud Rate

Generator

SBR12–SBR0

RXD

TXD

Module

Transmit

Control

÷16

Receive

and Wake up

Data Format

Control

RERR

RDRF

TIIE

TIDLE

RIDLE

RAF

LOOP

RWU

POL

WAKE

Clock

RERR

REIE

TIDLE

INTERRUPT

RSRC

SBK

LOOP

RSRC

REQUEST

RIIE

RIDLE

INTERRUPT

REQUEST

TEIE

TDRE

INTERRUPT

REQUEST

TDE

REQUEST

TDMA

RDMA

RFIE

REQUEST

RDRF/OR

INTERRUPT

REQUEST

RDME

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