z86e72 ZiLOG Semiconductor, z86e72 Datasheet - Page 6

• Manufacturer Part Number: z86e72
• Description: Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

General Description
PS008704-0507
Note:
The Z86E7X family are OTP-based members of the Z8
with 236 or 748 bytes of general-purpose RAM. The only differentiating factor
between the E72/73 versions is the availability of RAM and ROM. This EPROM
microcontroller family of OTP controllers also offers the use of external memory,
which enables this Z8 microcontroller to be used where code flexibility is required.
ZiLOG's CMOS microcontrollers offer fast execution, efficient use of memory,
sophisticated interrupts, input/output bit manipulation capabilities, automated
pulse generation/reception, and easy hardware/software system expansion along
with cost-effective and low power consumption.
The Z86E7X architecture is based on ZiLOG's 8-bit microcontroller core with an
Expanded Register File to allow access to register-mapped peripherals, I/O cir-
cuits, and powerful counter/timer circuitry. The Z8 offers a flexible I/O scheme, an
efficient register and address space structure, and a number of ancillary features
that are useful in many consumer, automotive, computer peripheral, and battery-
operated hand-held applications.
Z8 applications demand powerful I/O capabilities. The Z86E7X family fulfills this
with three package options in which the E72/73 versions provide 31 pins of dedi-
cated input and output. These lines are grouped into four ports. Each port consists
of eight lines (Port 3 has seven lines of I/O and one Pref comparator input) and is
configurable under software control to provide timing, status signals, parallel I/O
with or without handshake, and an address/data bus for interfacing external mem-
ory.
There are five basic address spaces available to support a wide range of
configurations: program memory, register file, Expanded Register File, Extended
Data RAM, and external memory. The register file is composed of 256 bytes of
RAM. It includes 4 I/O port registers, 16 control and status registers, and the rest
are general-purpose registers. The Extended Data RAM adds 512 (E72) of usable
general-purpose registers. The Expanded Register File consists of two additional
register groups (F and D).
To unburden the program from coping with such real-time problems as generating
complex waveforms or receiving and demodulating complex waveform/pulses, the
Z86E7X family offers a new intelligent counter/timer architecture with 8-bit and 16-
bit counter/timers
modes and two on-board comparators to process analog signals with separate
reference voltages
All signals with a preceding front slash, “/”, are active Low. For
example, B//W (WORD is active Low); /B/W (BYTE is active
Low, only).
(Figure
(Figure 19
1). Also included are a large number of user-selectable
on page 34).
®
MCU single-chip family
OTP Microcontroller
2