82c55a datasheet pdf

Input and Output data are latched. It was later cloned by other manufacturers. In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to dtaasheet from a floppy disk controller.

Interrupt logic is supported. Port A can be used for bidirectional handshake data transfer. The two halves of port C can be either used together as an additional 8-bit port, or they can be used as datawheet 4-bit ports.

Intel Intel D Interrupt logic is supported. This page was last edited on 23 Septemberat The two modes are selected on the basis of the value present at the D 7 bit of the control word register.

This mode is selected when D 7 bit of the Control Word Register is 1. This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website.

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To change delivery address the existing must be cancelled and item s re-ordered with the correct address. Eight Darlington drive outputs for printers and displays. Please ensure all security markings and stickers are intact or any warranty offered will be void. Skip to main content. Get the item you ordered or your money back.

All inputs and outputs TTL compatible. Mouse over to zoom — Click to enlarge. We will dispatch all orders the same day if the order has been placed before 3: Please enter up to 7 characters for the postcode.

This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website.

We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. Mode 1. Mode 2. Basic input output. Strobed Input output. Bi-directional Bus. Figure 4 Note After the reset is removed the. The modes for Port A and Port B can be separately. Mode 1 to monitor a keyboard or tape reader on an.

Figure 6 Mode Definition Format. The mode definitions and possible mode combina-. Such design represents the maximum use of the. Figure 5 Basic Mode Definitions and Bus. Single Bit Set Reset Feature. Any of the eight bits of Port C can be Set or Reset. When Port C is being used as status control for Port.