
Preliminary
HT83C51
HTMOS
TM
High Temperature Products
HIGH TEMPERATURE 83C51
MICROCONTROLLER
FEATURES
HTMOS Specified Over -55 to +225
°
C
8-bit CPU Optimized For 5 Volt Control Applications
Four 8-bit Bidirectional Parallel Ports
Three 16-bit Timer/Counters with One Up/Down
Timer/Counter and Clock Out
Programmable Counter Array with:
– Capture/Compare
– Software Timer with Watchdog Capability
– High Speed Output
– Pulse Width Modulator
Interrupt Structure with Seven Sources and
Four Priority Levels
Half Duplex Programmable Serial Port with:
– Framing Error Detection
– Automatic Address Recognition
64K External Program Memory Address Space
Hermetic 40-Pin Ceramic DIP
64K External Data Memory Address Space
256 Bytes Internal Data Memory
8K Byte Mask ROM
On-Chip Oscillator
MCS-51Compatible Instruction Set
Down-Hole Oil Well
Avionics
Turbine Engine Control
Industrial Process Control
Nuclear Reactor
Electric Power Conversion
Heavy Duty Internal Combustion Engines
The HT83C51 is a monolithic 8-bit microcontroller that is
pin equivalent to the Intel 8XC51FC microcontroller. Fab-
ricated with Honeywell’s dielectrically isolated high-tem-
perature (HTMOS) process, it is designed specifically for
severe high-temperature applications such as down-hole
oil well, aerospace, turbine engine and industrial control.
The HT83C51 uses the standard MCS-51 instruction set
which is optimized for control applications. Pin-for-pin
equivalent to the MCS-51 series product, it is compatible
with all known development environments. Key features
include the programmable counter array, watch dog timer,
enhanced serial port for multi-processor communication
GENERAL DESCRIPTION
and a hierarchical interrupt structure. Software selectable
idle is included for reduced power. The HT83C51 varies
from the standard 83C51FC, in that it supports half-duplex
serial communication, and has 8K Bytes of Mask program-
mable ROM. The device is available in a standard pinout
DIP, with optional packages considered.
These microcontrollers provide guaranteed performance
supporting operating frequencies in excess of 16 MHz
over the full -55 to +225
°
C temperature range. Typically,
parts will operate up to +300
°
C for a year, with derated
performance. All parts are burned in at 250
°
C to eliminate
infant mortality.
APPLICATIONS
Solid State Electronics Center 12001 State Highway 55, Plymouth, MN 55441 (800) 323-8295 http://www.ssec.honeywell.com