PB005802-0608

Page 3 of 4

Z85233 EMSCC™ Enhanced Mono Serial Communication Controller

Figure 2. Channel A Exploded View

TxDA

Trans mit Logic

Receive and Transmit Clock Multipexer

Transmit

Buffer

Digital

Phase-Locked

Loop

Baud Rate

Generator

Crystal

Oscillator

Amplifier

Modem/C ontrol Logic

Receive MUX

CRC Checker,

Data Decode &

Sync Character

Detection

Rec. Status

FIFO 3 Byte

Rec. Data

FIFO 3 Byte

SDLC Frame Status FIFO

10 x 19

R eceive Logic

Transmit MUX

Data Encoding & CRC

Generation

/T R xC A

/R T xC A

/C T S A

/DC DA

/S Y NC A

/R T S A

/DT R A//R E QA

RxDA