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11 page 
1-1 1 USER’S MANUAL CHAPTER 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The Zilog SCC Serial Communication Controller is a dual channel, multiprotocol data communication peripheral de- signed for use with 8- and 16-bit microprocessors. The SCC functions as a serial-to-parallel, parallel-to-serial con- verter/controller. The SCC can be software-configured to satisfy a wide variety of serial communications applica- tions. The device contains a variety of new, sophisticated internal functions including on-chip baud rate generators, digital phase-lock loops, and crystal oscillators, which dra- matically reduce the need for external logic. The SCC handles asynchronous formats, synchronous byte-oriented protocols such as IBM® Bisync, and syn- chronous bit-oriented protocols such as HDLC and IBM SDLC. This versatile device supports virtually any serial data transfer application (telecommunication, LAN, etc.) The device can generate and check CRC codes in any synchronous mode and can be programmed to check data integrity in various modes. The SCC also has facilities for modem control in both channels. In applications where these controls are not needed, the modem controls can be used for general-purpose I/O. With access to 14 Write registers and 7 Read registers per channel (the number of the registers varies depending on the version), the user can configure the SCC to handle all synchronous formats regardless of data size, number of stop bits, or parity requirements. Within each operating mode, the SCC also allows for pro- tocol variations by checking odd or even parity bits, char- acter insertion or deletion, CRC generation, checking break and abort generation and detection, and many other protocol-dependent features. The SCC/ESCC family consists of the following seven devices; As a convention, use the following words to distinguish the devices throughout this document. The Z-Bus version has a multiplexed bus interface and is directly compatible with the Z8000, Z16C00 and 80x86 CPUs. The Universal version has a non-multiplexed bus interface and easily interfaces with virtually any CPU, in- cluding the 8080, Z80, 68X00. Z-Bus® Universal-Bus NMOS Z8030 Z8530 CMOS Z80C30 Z85C30 ESCC Z80230 Z85230 EMSCC Z85233 SCC: Description applies to all versions. NMOS: Description applies to NMOS version (Z8030/Z8530) CMOS: Description applies to CMOS version (Z80C30/Z85C30) ESCC: Description applies to ESCC (Z80230/Z85230) EMSCC: Description applies to EMSCC (Z85233) Z80X30: Description applies to Z-Bus version of the device (Z8030/Z80C30/Z80230) Z85X3X: Description applies to Universal version of the device (Z8530/Z85C30/Z85230/Z85233) UM010901-0601 |
