MD82C55A datasheet by Harris Semiconductor

MD82C55A Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the MD82C55A can operate at?
  The MD82C55A can operate at a maximum clock frequency of 3 MHz.
• How do I interface the MD82C55A with a microcontroller?
  The MD82C55A can be interfaced with a microcontroller using the chip select (CS), read (RD), and write (WR) signals. The microcontroller should assert the CS signal low, then assert the RD or WR signal low to read or write data to the MD82C55A.
• What is the purpose of the VPP pin on the MD82C55A?
  The VPP (Programming Voltage) pin is used to supply the programming voltage required for programming the device. It should be connected to a voltage source of 12.5V ± 0.5V during programming.
• Can I use the MD82C55A in a 5V system?
  Yes, the MD82C55A can operate in a 5V system, but it requires a 12.5V programming voltage to program the device. The VCC pin should be connected to a 5V power supply, and the VPP pin should be connected to a 12.5V power supply during programming.
• How do I program the MD82C55A?
  The MD82C55A can be programmed using a programming algorithm provided by Harris Semiconductor. The algorithm typically involves setting the device in programming mode, loading the data to be programmed, and then verifying the data.