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Z86C90/C89

The Z86C90/C89 CCP™ (Consumer Controller Processor) in-

troduces a new level of sophistication to single-chip architecture.

The Z86C90/C89 are ROMless members of the Z8 single-chip

microcontroller family with 236 bytes of general purpose RAM.

The only difference that exists between the Z86C89 and the

Z86C90 is that the on-chip oscillator of the Z86C89 can accept an

external RC network or other external clock source, while the

Z86C90's on-chip oscillator accepts a crystal, ceramic resonator,

LC, or external clock source drive. The CCP controllers are

housed in a 40-pin DIP, 44-pin Leaded Chip Carrier, or a 44-pin

Quad Flat Pack, and are CMOS compatible. The CCP offers the

use of external memory which enables this Z8 microcomputer to

be used where code flexibility is required. Zilog's CMOS micro-

computer offers fast execution, efficient use of memory, sophis-

ticated interrupts, input/output bit manipulation capabilities, and

easy hardware/software system expansion along with low cost

and low power consumption.

The Z86C90/C89 architecture is based on Zilog's 8-bit

microcontroller core with an Expanded Register File to allow

access to register mapped peripheral and I/O circuits. The CCP

offers a flexible I/O scheme, an efficient register and address

space structure, and a number of ancillary features that are useful

in many industrial, automotive, computer peripherals, and ad-

vanced scientific applications.

The CCP applications demand powerful I/O capabilities. The

Z86C90/C89 fulfills this with 32 pins dedicated to input and

output. These lines are grouped into four ports. Each port consists

of eight lines, and is configurable under software control to

provide timing, status signals, parallel I/O with or without hand-

shake, and an address/data bus for interfacing external memory.

There are four basic address spaces available to support this wide

range of configurations: Program Memory, Register File, Data

Memory, and Expanded Register File. The Register File is

composed of 236 bytes of general purpose registers, four I/O port

registers, and fifteen control and status registers. The Expanded

Register File consists of two control registers.

To unburden the program from coping with the real-time prob-

lems, such as counting/timing and data communication, the

Z86C90/C89 offers two on-chip counter/timers. Included are a

large number of user selectable modes, and two on-board com-

parators to process analog signals with a common reference

voltage (see Functional Block Diagram).

Notes:

All Signals with a preceding front slash, "/", are active Low, e.g.: B//W

(WORD is active Low); /B/W (BYTE is active Low, only).

Power connections follow conventional descriptions below:

Connection

Circuit

Device

Power

V

CC

V

DD

Ground

GND

V

SS

GENERAL DESCRIPTION

DC-4054-01

(10-17-91)