C.3 Port 3 Block Diagram
Figure C-3 Port 3 Block Diagram
P3
n
Reset
R
P3 DDR
n
WP3D
Q
D
C
Reset
R
P3 DR
n
WP3
Q
D
C
RP3
Mode
1 to 6
Internal data bus (upper)
WP3D:
WP3:
RP3:
n = 0 to 7
Write to P3DDR
Write to port 3
Read port 3
Mode 7
Write to external
address
Mode 7
Hardware standby
External
bus released
Read external
address
Internal data bus (lower)
826
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