Intel 8255

Intel 8255 (also i8255 ) is a programmable parallel input / output block that is designed primarily for the Intel 8085 processor. Later, he was also used with the Intel 8086 and its successors. The module is supplied in a 40 pin DIL package. He was licensed to, inter alia, AMD, Mitsubishi Electric, National Semiconductor, NEC and Siemens.

His greatest notoriety has the Intel 8255 obtained by using the parallel port of IBM - PCs. It was also used in personal computers, such as the SV -328 and MSX computers.

The Intel 8255 has three 8 -bit IO ports to two groups of ports (port - group A and port group B) are summarized.

  • Port A ( PA0 to PA7 ) and PC4 to PC7 of port C form Port- Group A
  • Port B ( PB0- PB7 ) and PC0 to PC3 of the port C form port group B

The port - groups may be operated in different modes. For the 8255 has a control register which can be written via the data bus ( D0- D7).

Intel 82C55 -8

Literature and data sheets

  • Horst Pelka: Practice with microprocessors, 2nd edition, Franzis -Verlag, Munich 1980, ISBN 3-7723-6582-5, pp. 54-58.
  • Microcomputer modules, Data Book 1979/80, Volume 3, peripherals, Siemens AG, No. B 2049, pp. 124-164.
  • NEC Electronics (Europe) GmbH, 1982 Catalog, pp. 657-664.
  • I / O- chip
  • Intel
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