C.8 Port 8 Block Diagrams
Figure C-8 (a) Port 8 Block Diagram (Pin P8
0
)
P8
0
RP8
WP8D
Reset
Q
D
R
C
P8 DDR
0
WP8
Reset
Q
D
R
C
P8 DR
0
WP8D:
WP8:
RP8:
Write to P8DDR
Write to port 8
Read port 8
Internal data bus
Refresh
controller
Output
enable
output
Interrupt
controller
input
RFSH
IRQ
0
Mode 7
834
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