ZILOG Z861405PSC, Z861405VSC Datasheet

1

Z8614

CPS DC-4038-03

DESCRIPTION

DC 4038-03 (11-2-93)

The Z8614 Keyboard Controller (KBC™) introduces a new level
of sophistication to single-chip architecture. The Z8614 is a
member of the Z8 single-chip microcontroller family with 4
Kbytes of ROM.

The Z8614 KBC is housed in 40-lead DIP and 44-lead PLCC
packages, and is manufactured in NMOS technology. Zilog’s
microcontroller offers fast execution, efficient use of memory,
sophisticated interrupt, input/output bit manipulation capabili­ties, and easy hardware/software system expansion along with
low cost and low power consumption.

The KBC architecture is characterized by a flexible I/O scheme,
an efficient register, I/O, and a number of ancillary features that
are useful in keyboard applications.

The device applications demand powerful I/O capabilities. The
KBC fulfills this with 32 pins dedicated to input and output.
These lines are grouped into four ports, each port consists of eight
lines, and are configurable under software control to provide
timing, status signals, and serial or parallel I/O ports.

The Z8614 offers low EMI emission achieved by means of

Z8614

KEYBOARD CONTROLLER (KBC

™

)

NMOS Z8® 8-BIT MCU

several modifications in the output drivers and clock circuitry of
the device.

There are two basic address spaces available to support this wide
range of configurations: Program Memory and 124 General­Purpose Registers.

The KBC offers two on-chip counter/timers with a large number
of user selectable modes. This unburdens the program from
coping with real-time problems such as counting/timing.

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

CUSTOMER PROCUREMENT SPECIFICATION

2

Z8614

CPS DC-4038-03

GENERAL DESCRIPTION (Continued)

Port 3

Counter/

Timers (2)

Interrupt

Control

Port 2

I/O

(Bit Programmable)

ALU

Flags

Register

Pointer

Register File

124 x 8 Bit

Machine

Timing & Inst.

Control

Program

Memory

Program

Counter

Vcc GND XTAL1

XTAL2 /RESETOutput Input

Port 0 Port 1

I/O

Output Open Drain

(Nibble Programmable)

I/O

Output Open Drain

(Byte Programmable)

44 8

Functional Block Diagram