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