The C8254 core implements a high performance programmable interval timer/counter device, which is designed to solve the common timing control problems in microcomputer system design. It provides three independent 16-bit counters, and each counter may operate in a different mode. All modes are software programmable.

The C8254 solves one of the most common problems in any microcomputer system, the generation of accurate time delays under software control programmed to match the requirements by programming one of the counters for the desired delay.


Features

      •  Three Independent 16-bit Counters
      •  Status Read-Back Command
      •  Counter Latch Command
      •  Read/Write LSB only or MSB only or LSB first then MSB
      •  Six Programmable Counter Modes
  　　　□　Interrupt on Terminal Count
　  　　□　Hardware Retriggerable One-Shot
　　  　□　Rate Generator
　　　  □　Square Wave Mode
  　　　□　Software Triggered Strobe
　  　　□　Hardware Triggered Strobe（Retriggerable）
      •  Binary or BCD Counting
      •  The C8254 was developed in HDL and synthesizes to approximately 4,200 gates depending on
　　　the technology used
      •  Functionality based on the INTEL 8254


Applications

The six programmable timer modes allow the C8254 to be used in applications requiring event counters including：
      •  elapsed time indicators
      •  programmable one-shots