Z80C30 datasheet(11/81 Pages) ZILOG

11 / 81 page

PS011706-0511

General Description

CMOS SCC Serial Communications Controller

Product Specification

General Description

The Z80C30/Z85C30 Serial Communications Controller (SCC), is a pin and software

compatible CMOS member of the SCC family introduced by Zilog in 1981. It is a dual-

channel, multiprotocol data communications peripheral that easily interfaces with CPU’s

with either multiplexed or nonmultiplexed address/data buses.

The advanced CMOS process offers lower power consumption, higher performance, and

superior noise immunity. The programming flexibility of the internal registers allow the

SCC to be configured to various serial communications applications.

The many on-chip features such as Baud Rate Generators (BRG), Digital Phase Locked

Loops (DPLL), and crystal oscillators reduce the need for an external logic.

Additional features include a 10 x 19-bit status FIFO and 14-bit byte counter to support

high speed SDLC transfers using DMA controllers.

The SCC handles asynchronous formats, synchronous byte-oriented protocols such as

IBM Bisync, and synchronous bit-oriented protocols such as HDLC and IBM SDLC. This

device supports virtually any serial data transfer application (for example, cassette,



diskette, tape drives, etc.).

The device generates and checks CRC codes in any synchronous mode and can be



programmed to check data integrity in various modes. The SCC also contains facilities for

modem controls in both channels. In applications where these controls are not required,

the modem controls can be used for general-purpose I/O. The daisy-chain interrupt hierar-

chy is also supported.

Figure 1 displays a block diagram of the SCC.

Z80C30 Datasheet(PDF) 11 Page - Zilog, Inc.