Z8681 Datasheet | Zilog

Z8® Z8681/82 ROMless Microputer Product Specification March 1983 Co Pyrighti983l;>y Zilog, Inc. All rights reserved. No part of this..publication may be reproduced without the written parmissien of Zilog, Inc. The 1!>locmation in this publication is subject to change witho Ut notice. Zilog Z8® Z8681/82 BOMless Microputer Product Specification Features General Description - plete microputer, 24 I/O lines, and up to 64K bytes of addressable external space each for program and data memory. - 143-byte register file, including 124 general-purpose registers, three I/O port registers, and 16 status and control registers. - Vectored, priority interrupts for I/O, counter/timers, and UART. - On-chip oscillator that accepts crystal or external clock drive. The Z8681and Z8682 are ROMless versions of the Z8 single-chip microputer. The Z8682 is usually more cost effective. These products differ only slightly and can be used interchangeably with proper system design to provide maximum flexibility in meeting price and delivery needs. The Z8681182 offers all the outstanding Features of the 28 family architecture except an on-chip program ROM. Use of external memory rather than a preprogrammed ROM enables this Z8 microputer March 1983 - Full-duplex UART and two programmable 8-bit counter/timers, each with a 6-bit programmable prescaler. - Register Pointer so that short, fast instructions can access anyone of the nine working-register groups. - Low-power standby option that retains contents of general-purpose registers. - Single + 5 V power supply-all I/O pins TTL patible. - Available in 8 and 12 MHz versions. to be used in low volume applications or where code flexibility is required. The Z8681182 can provide up to 16 output address lines, thus permitting an address space of up to 64K bytes of data or program memory. Eight address outputs (ADo-AD7) are provided by a multiplexed, 8-bit, Address/Data bus. The remaining 8 bits can be provided by the software...