basic i/o interface
Post on 30-Dec-2015
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Basic I/O Interface
Instruksi I/O◦IN◦OUT◦INS◦OUTS
Isolated dan Memory Mapped I/O
Basic Input dan Output Interface
I/O Port Address Decoding◦I/O port address decoding = memory
address decoding The main difference between
memory decoding and isolated I/O decoding is the number of address pins connected to the decoder.
Untuk memori : A32-A0, A23- A0 atau A19- A0
Untuk I/O addressing : A7- A0
Decoding 8-Bit I/O Port Addresses
The Programmable Peripheral Interface (PPI) – 82C55
A
A
B
B
Mode OperasiMode 0Mode 1Mode 2
Common Byte A
Common Byte B
Buatlah rangkaian I/O interface untuk 8 buah I/O yang ingin diakses pada port 70H – 77H
Buatlah rangkaian 82C55 yang dihubungkan ke mikroprosesor pada port F0H, F4H, F8H, FCH
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