Z80230 View Datasheet(PDF) - Zilog

Part Name

Description

MFG CO.

Z80230

Zilog SCC Serial Communication Controller

Zilog 

SCC™/ESCC™ User’s Manual

SCC/ESCC Ancillary Support Circuitry

3.5 CLOCK SELECTION (Continued)

2. The x1 mode in Asynchronous mode is a combination

of both synchronous and asynchronous transmission.

The data is clocked by a common timing base, but

characters are still framed with Start and Stop bits.

Because the receiver waits for one clock period after

/SYNC

/RTxC

OSC

OSC

/TRxC

detecting the first High-to-Low transition before

beginning to assemble characters, the data and clock

is synchronized externally. The x1 mode is the only

mode in which a data encoding method other than

NRZ is used.

RX

Receiver

TX

Transmitter

Baud Rate

Generator Out

Tx DPLL Out

Rx DPLL Out

PCLK

Echo

Echo

DPLL

BRG

Figure 3-10. Clock Multiplexer

DPLL

Baud Rate

Generator

3-12

UM010901-0601

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