Datasheet > A8255

A8255

更新时间： 2024-11-08 22:26:51

品牌	Logo	应用领域
阿尔特拉 - ALTERA		/
页数	文件大小	规格书
13页	244K
描述
PROGRAMMABLE PERIPHERAL INTERFACE ADAPTER

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A8255 数据手册

a8255

Programmable Peripheral

Interface Adapter

September 1996, ver. 1

■ a8255MegaCore function implementing a programmable

Features

peripheral interface adapter

■

Optimized for FLEX^®and MAX^®architectures

24 programmable inputs/outputs

Static read/write or handshaking modes

Direct bit set/reset capability

Synchronous design

Uses approximately 194 FLEX logic elements (LEs)

Functionally based on the Intel 8255A and Harris 82C55A devices,

except as noted in the “Variations & Clarifications” section on

page 56

The a8255MegaCore function implements a programmable peripheral

interface adapter (see Figure 1). The a8255has 24 I/O signals that can be

programmed in two groups of 12. This MegaCore function operates in the

following three modes:

General

Description

■

Mode 0: Basic Input/Output—Port A, port B, and port C (upper and

lower) can be independently configured as inputs or outputs to read

or hold static data. Outputs are registered; inputs are not registered.

Mode 1: Strobed Input/Output—Port A and port B can be

independently configured as strobed input or output buses. Signals

from port C are dedicated as control signals for data handshaking.

Mode 2: Bidirectional Bus—Port A can be configured as a bidirectional

bus with the majority of port C providing the control signals. In this

configuration, port B can still implement mode 0 or mode 1.

Figure 1. a8255 Symbol

A8255

CLK

nCS

nRD

PAEN

PBEN

nWR

DOUT[7..0]

PAOUT[7..0]

PBOUT[7..0]

PCEN[7..0]

RESET

A[1..0]

DIN[7..0]

PAin[7..0]

PBin[7..0]

PCin[7..0]

PCOUT[7..0]

Altera Corporation

A-DS-A8255-01

12 3 4 5 6 7...13

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