A8255 Datasheet | Altera Corporation

September 1996, ver. 1 ® a8255 Programmable Peripheral Interface Adapter Features General Description s a8255 MegaCore function implementing a programmable peripheral interface adapter s Optimized for FLEX® and MAX® architectures s 24 programmable inputs/outputs s Static read/write or handshaking modes s Direct bit set/reset capability s Synchronous design s Uses approximately 194 FLEX logic elements (LEs) s Functionally based on the Intel 8255A and Harris 82C55A devices, except as noted in the “Variations & Clarifications” section on page 56 The a8255 MegaCore function implements a programmable peripheral interface adapter (see Figure 1). The a8255 has 24 I/O signals that can be...