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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