2. ENEE 440 Chapter 6

3. 8255 PPI

4. 8255 Register Select -CS A1 A0 REGISTER R/W 0 0 0 PORT A R/W 0 0 1 PORT B R/W 0 1 0 PORT C R/W 0 1 1 CR W 1 X X8255 NOT SELECTED

5. 8255 Interfaced to PC

6. 8255 -to-PC Decoding Chart

7. 8255 Register Addresses Port A300 Port B301 Port C302 Control Register303

8. 8255 Control Word

9. Read in Switches and Display Output !Configuration of 8255 in mode 0 with Port A as input and Port B as output mov dx, 303h mov al, 90h out dx, al !Read Port A and send data to Port B mov dx, 300h in al, dx mov dx, 301h out dx, al