Port_Interfacing

Port_Interfacing - I/O Interfacing May be classified as...

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Unformatted text preview: I/O Interfacing May be classified as: Isolated I/O; Memory mapped I/O. Instructions: IN accumulator, source; OUT destination, destination, accumulator. Basic I/O Interfaces Deboucing Mechanical switches bounce when they are actuated actuated. A circuit is circuit is needed to ensure that the output of the switch provides a single transition upon the switch actuation, instead of a sequence of transitions. This circuit is called circuit is called a debouncer. Port Example 16 bits output port decoded at addresses decoded at addresses 40H and 41H. It used two latches (74ALS374) and a 16L8 used to decode the addresses the addresses. Intel 82C55 - PPI The Intel 82C55 programmable peripheral interface is a low cost device that allow the user 24 I/O allow the user 24 I/O connections which may be grouped in different ways with up to three different modes of operation. ti Intel 82C55 - PPI Programming the Intel 82C55T The 82C55 is programmed by sending a command byte to the control byte to the control register. This command byte defines how the 82C55 will work It defines 82C55 will work. It defines the mode of operation and which ports are input or output. 8 Digit LED Display Example Keyboard Interface Example ...
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This note was uploaded on 02/16/2011 for the course EE 3751 taught by Professor Desouza during the Spring '04 term at LSU.

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Port_Interfacing - I/O Interfacing May be classified as...

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