Memory Mapped Input/output

MEMORY MAPPED I/O


--> has 16 bit device address
--> MEMR(bar)/MEMW(bar) are control signals for input and output.
--> all memory related instruction like STA, LDA, LDAX etc are available.
--> Data transfer occurs between any register and I/O.
--> the memory map of 64K is shared between I/O and system memory.
--> general execution speed of 13 and 7 t states.
--> more hardware is required to decode 16 bit address.
--> arithmetic and logical operation can be directly performed with I/O data.

MEMORY MAPPED INPUT/OUTPUT