The Intel MD8253/B is a programmable interval timer (PIT) designed for use in microcomputer systems. It provides three independent 16-bit counters, each capable of operating in several different modes. These counters can be used for a wide variety of timing applications, including generating accurate time delays, counting events, and generating programmable waveforms. The 'B' designation typically indicates an improved or later revision of the original 8253.

Applications

• Real-time clocks
• Event counters
• Programmable one-shot
• Frequency generator
• Square wave generator
• Motor speed control

Features

• Three independent 16-bit counters
• Six programmable operating modes
• Binary or BCD counting
• Read/write capability for all counters
• Single 5V power supply

Benefits

• Versatile timing solution for microcomputer systems
• Accurate and reliable timing
• Reduced CPU overhead for timing tasks
• Simplified system design
• Flexible configuration options to suit various application needs

Additional Details

The MD8253/B communicates with the microprocessor via an 8-bit data bus and control signals. The operating mode of each counter is determined by a control word written to the control register. The counters can be configured to operate in binary or BCD counting mode. The device provides read/write capability for all counters, allowing the microprocessor to dynamically modify the counter values. The six operating modes offer a wide range of functionality, including interval timer, rate generator, square wave generator, hardware triggered strobe, and software triggered strobe. The MD8253/B is typically packaged in a 24-pin DIP package. It is a staple component in many legacy embedded systems where precise and flexible timing control is required.