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.

• Specified Over -55 to 225°C
• On-Chip Oscillator
• 8-bit CPU Optimized for 5 Volt Control Applications
• Interrupt Structure with Seven Sources and Four Priority Levels
• Four 8-bit Bidirectional Parallel Ports
• Half Duplex Programmable Serial Port with Framing Error Detection and Automatic Address Recognition Three 16-bit Timer/Counters with One Up/Down Timer/Counter and Clock Out
• 256 Bytes Internal Data Memory
• 64K External Data Memory Address Space
• Hermetic 40-pin Ceramic Dip
• MCS-51 Compatible Instructions Set
• Parts burned in at 250°C
• Programmable Counter Array with:
• Capture/Compare, Software Timer with Watchdog Capability, High Speed Output, and Pulse Width Modulator

• Downhole Oil Well, Avionics
• Turbine Engine Control
• Industrial Process Control
• Nuclear Reactor
• Electric Power Conversion
• Heavy Duty Internal Combustion Engine