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Tuesday, June 14, 2011

Peripheral Mapped Input/Output



PERIPHERAL MAPPED I/O


--> has 8 bit device address
--> uses IOR(bar)/IOW(bar) as control signals for inout and output.
--> only IN and OUT instruction are available.
--> Data transfer occurs only between I/o and accumulator.
--> the I/O map is independent of memory map and 256 input and 256 ouput devices can be connected.
--> general execution speed of 10 T states.
--> less hardware is needed to decode 8 bit address line.
--> no arithmetic and logical operation are available.


PERIPHERAL MAPPED INPUT/OUTPUT

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