可編程ic卡 通用嗎

Introduction

介紹

An 8255 programmable integrated circuit (IC) is an IC used for interfacing the microprocessor with the peripheral devices. It is a 40 pin IC which was introduced by INTEL to use with its 8085 and 8086 microprocessors.

8255可編程集成電路(IC)是用于將微處理器與外圍設備接口的IC。 它是INTEL推出的40引腳IC，用于其8085和8086微處理器。

Ports of 8255

端口8255

There are three input/output 8-bit ports in this IC namely port A, port B, port C. The port C can be divided into two each of 4 bits(C upper and C lower) according to requirement.

該IC中有3個輸入/輸出8位端口，即端口A，端口B，端口C。根據需要，端口C可以分為4位(C高和C低)中的兩個。

Architecture of 8255

8255的體系結構

Pin diagram of 8255

8255的引腳圖

• The pins 1-4 and 37-40 are for Port A(PA0-PA7).

  引腳1-4和37-40用于端口A(PA0-PA7)。

• The pins 18-25 are for port B(PB0-PB7).

  引腳18-25用于端口B(PB0-PB7)。

• The pins 10-17 are for port C(PC0-PC7).

  引腳10-17用于端口C(PC0-PC7)。

• The pins 27-34 are for data bus(D0-D7) linked to the microprocessor.

  引腳27-34用于鏈接到微處理器的數據總線(D0-D7)。

• The RD(5) and WR(36) are two low active pins for reading and write operations respectively. When a low signal is sent to the pin no 5 it means a read operation is performing. Similarly, when a low signal is sent to pin no 36 this means the write operation is being performed.

  RD(5)和WR(36)是兩個低有效引腳，分別用于讀取和寫入操作。 當低電平信號發送到5號引腳時，表示正在執行讀操作。 同樣，當低信號發送到引腳36時，這意味著正在執行寫操作。

• The CS(chip select) is another low active pin that works as an enable to the IC.

  CS(片選)是另一個低電平有效引腳，用作IC的使能。

• The A0 and A1 are the control logic at 8 and 9.

  A0和A1是8和9處的控制邏輯。

• A0 A1

  A0 A1

• 0 0 port A

  0 0端口A

• 0 1 port B

  0 1端口B

• 1 0 port C

  1 0端口C

• 1 1 Control Word logic(CWR)

  1 1控制字邏輯(CWR)

• These select the ports.

  這些選擇端口。

• The RESET pin at 35 used to reset the IC.

  35處的RESET引腳用于復位IC。

• The ground(7) and Vcc(26) are also present to establish the potential difference.

  接地(7)和Vcc(26)也存在以建立電勢差。

Modes of 8255

8255的模式

This IC works in 3 modes

該IC工作在3種模式

Mode 0 in which all the three ports act as input-output ports.

模式0，其中所有三個端口都充當輸入-輸出端口。

Mode 1 in which only port A and port B act as input-output port while port C is used for handshaking.

模式1，其中僅端口A和端口B充當輸入-輸出端口，而端口C用于握手。

Mode 2 in which only port A is used as a bidirectional port for both input-output.

模式2，其中僅端口A用作兩個輸入輸出的雙向端口。

Control word logic (CWL)

控制字邏輯(CWL)

Everything in the 8255 IC is dependent on the CWL. There are 8 bits in the CWL:

8255 IC中的所有內容均取決于CWL。 CWL中有8位：

D0 port Clower

D0端口割草機

D1 port B

D1端口B

D2 Mode

D2模式

D3 port Cupper

D3端口銅

D4 port A

D4端口A

D5 Mode

D5模式

D6 Mode

D6模式

D7 BSR(Bit Set Reset)/I/O mode

D7 BSR(位設置重置)/ I / O模式

We can set the CWL by using the IN and OUT command of the respective microprocessor.

我們可以使用相應微處理器的IN和OUT命令設置CWL。

翻譯自: https://www.includehelp.com/embedded-system/the-8255-programmable-ic.aspx

可編程ic卡 通用嗎

創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

總結

以上是生活随笔為你收集整理的可编程ic卡 通用吗_8255可编程IC的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。