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)
NMOS Z8
廬
8-BIT MCU
DESCRIPTION
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鈥檚
microcontroller offers fast execution, efficient use of memory,
sophisticated interrupt, input/output bit manipulation capabili-
ties, 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
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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 General-
Purpose 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
Power
Ground
Circuit
V
CC
GND
Device
V
DD
V
SS
DC 4038-03
(11-2-93)
1
1
2
3
4
