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Engineering 4862 Microprocessors Lecture 23

Engineering 4862 Microprocessors Lecture 23. Cheng Li EN-4012 licheng@engr.mun.ca. I/O Design. When designing an I/O port, ensure that the port is only active when selected by the microprocessor

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560 views • 42 slides

8255:Programmable Peripheral Interface

8255:Programmable Peripheral Interface. Block Diagram. Function of pins:. Data bus(D 0 -D 7 ) :These are 8-bit bi-directional buses, connected to 8085 data bus for transferring data. CS: This is Active Low signal. When it is low, then data is transfer from 8085.

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3.85k views • 16 slides

8255 Programmable Peripheral Interface

8255 Programmable Peripheral Interface. 8255. It is a programmable peripheral Interface with three i/o ports A 8 bits B 8 bits C 4 bits upper and 4 bits lower. Pin diagram 8255. 8 bit i/o ports. PA, PB, PC (Port A,B,C). CS (Chip Select). A low signal at this pin enables the chip.

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192 views • 8 slides

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Bsr mode - PowerPoint PPT Presentation

Engineering 4862 Microprocessors Lecture 23

8255:Programmable Peripheral Interface

8255 Programmable Peripheral Interface