Preliminary

HT83C51

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