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  • D8255

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Programmable Peripheral Interface

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D8255 Product Details

The D8255 is a programmable I/O device which is designed for use with all Intel and most other microprocessors. It provides 24 I/O pins which may be individually programmed in 2 groups of 12 and used in 3 major modes of operation:

● Mode 0 - Basic Input/Output. This functional configuration provides simple input and output operations for each of the three ports. No „handshaking'' is required, data is simply written to or read from a specified port. Mode 0 Basic Functional Definitions:
  ○Two 8-bit ports and two 4-bit ports.
  ○Any port can be input or output.
  ○16 different Input/Output configurations are possible in this Mode

● MODE 1 - Strobed Input/Output. This functional configuration provides a means for transferring I/O data to or from a specified port in conjunction with strobes or „handshaking'' signals. In mode 1, Port A and Port B use the lines on Port C to generate or accept these „handshaking'' signals. Mode 1 Basic functional Defini
   ○Two Groups (Group A and Group B).
   ○Each group contains one 8-bit data port and one 4-bit control/data port.
   ○The 8-bit data port can be either input or output Both inputs and outputs are latched.
   ○The 4-bit port is used for control and status of the 8-bit data port.

● MODE 2 - Strobed Bidirectional Bus I/O. This functional configuration provides a means for communicating with a peripheral device or structure on a single 8-bit bus for both transmitting and receiving data (bidirectional bus I/O). „Handshaking'' signals are provided to maintain proper bus flow discipline in a similar manner to MODE 1. Interrupt generation and enable/disable functions are also
available. MODE 2 Basic Functional Definitions:
  ○Used in Group A only.
  ○One 8-bit, bi-directional bus port (Port A) and a 5-bit control port (Port C).
  ○The 5-bit control port (Port C) is used for control and status for the 8-bit, bi-directional bus port (Port A)


●Compatible with industry standard 8255
●24 I/O lines individually programmed in 2 groups of 12:
   ○Group A - Port A and upper half of Port C
   ○Group B – Port B and lower half of Port C
●3 major modes of operation
   ○Mode 0 – Basic input/output
   ○Mode 1 – Strobed Input/output
  ○Mode 2 – Bi-directional Bus
●Control Word Read-Back Capability
●Direct Bit Set/Reset Capability
●Interrupt control functions
●No internal three states busses
●Fully synthesizable technology independent source code.

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Estimated Delivery Time: Sep 27 - Oct 02 days (choose Expedited at checkout).

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    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

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    Lowest international shipping fee starts from US$2.00.

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    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that D8255 is the original manufacturer or agent of INTEL?
We have a professional business development department to strictly test and verify the qualifications of INTEL original manufacturers and agents. All INTEL suppliers must pass the qualification review before they can publish their D8255 devices; we pay more attention to the channels and quality of D8255 products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of D8255 chips? Including INTEL original factory information, application, D8255 pictures?
You can use Jotrin's intelligent search engine, or filter by Interface ICs category, or find it through Intel Corp Information page.
Q: Are the INTEL's D8255 price and stock displayed on the platform accurate?
The INTEL's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for D8255, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of D8255?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the D8255 we delivered, we will accept the replacement or return of the D8255 only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of D8255.
(3)The D8255 is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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