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A8255 Datasheet(PDF) 3 Page - Altera Corporation |
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A8255 Datasheet(HTML) 3 Page - Altera Corporation |
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3 / 13 page 
Altera Corporation 47 a8255 Programmable Peripheral Interface Adapter Data Sheet Functional Description Figure 2 shows a block diagram of the a8255. Figure 2. a8255 Block Diagram Data Output Select Control Register Data Port A Output Register Control Register & Logic reset ncs nrd nwr a[1..0] din[7..0] Data Output Multiplexer paen pben pcen[7..0] dout[7..0] Port A Input Register Port C Output Register & Control Port B Input Register Port B Output Register Port Control Bus paout[7..0] pain[7..0] pbout[7..0] pbin[7..0] pcout[7..0] pcin[7..0] Port C Status |
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