Different Between Memory Mapped I/O and Peripheral I/O
Memory Mapped I/O V/S Peripheral I/O :
Characteristic
|
Memory
Mapped I/O
|
Peripheral I/O
|
1 . Device Address
|
16 Bit
|
8 Bit
|
2 . Data Transfer
|
Between any
microprocessor register and I/O.
|
Only
between I/O and accumulator.
|
3 . Inactions Available
|
LDA;STA;LDAX;LTAX;MOV;M,R
etc.
|
IN;OUT
|
4 . Execution Speed
|
13 T-State
(LDA,STA)
7 T-State
(MOV, M,R)
|
10 T-State
|
5 . Hardware Requirement
|
More
hardware is needed to decode 16 Bit address.
|
Less
hardware is needed to decode 8 Bit address.
|
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