Z87C33
CMOS Z8“ MCU Consumer Controller Processor
1
Architectural Overview
ZiLOG’s large Z8
®
family of 8-bit microcontrollers now includes the Z87C33 prod-
uct line, featuring an enhanced wake-up circuitry, programmable Watch-Dog Tim-
ers (WDT), and low-noise/EMI options. These enhancements to the Z8 offers a
more efficient, cost-effective design and provides the user with increased design
flexibility over the standard Z8 microcontroller core. The low-power-consumption
CMOS microcontroller offers fast execution, efficient use of memory, sophisticated
interrupts, input/output bit manipulation capabilities, and easy hardware/software
system expansion.
The Z87C33 subfamily features an Expanded Register File (ERF) to allow access
to register-mapped peripheral and I/O circuits. Four basic address spaces are
available to support this wide range of configurations: Program Memory, Register
File, and ERF. The Register File is composed of 237 bytes of general-purpose
registers, three I/O port registers, 15 control and status registers. The ERF con-
sists of four control registers.
For applications demanding powerful I/O capabilities, the Z87C33 offers 24 pins
dedicated to input and output. These lines are configurable under software con-
trol.
The Z87C33 family operates at 4MHz with a voltage range of 3.0 to 5.5V
DC
.
To unburden the system from coping with real-time tasks such as counting/timing,
the Z8 offers two on-chip counter/timers with a large number of user-selectable
modes.
Note:
All signals with an overline are active Low. For example, B/W,
for which WORD is active Low, and B/W, for which BYTE is
active Low.
Power connections follow these conventional descriptions:
Connection
Power
Ground
Circuit
V
CC
GND
Device
V
DD
V
SS
PS015601-1003
ZILOG [ ZILOG, INC. ]
