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HIGH TEMPERATURE 83C51 MICROCONTROLLER
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
• 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

APPLICATIONS
• Down-Hole Oil Well
• Avionics
• Turbine Engine Control
• Industrial Process Control
• Nuclear Reactor
• Electric Power Conversion
• Heavy Duty Internal Combustion Engines

GENERAL DESCRIPTION
The HT83C51 is a monolithic 8-bit microcontroller that is pin equivalent to the Intel 8XC51FC microcontroller. Fabricated with Honeywell’s dielectrically isolated high-temperature (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 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 programmable 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.

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