HD6475328CG Datasheet, PDF (423/459 Pages) Hitachi Semiconductor – Manual Gives a Hardware Description

C.3 Schematic Diagram of Port 3
Figure C-3 gives a schematic view of the port 3 input/output circuits.
Data bus control
Mode 1, 2, 3, or 4
Reset
Mode 7
R
QD
P3 n DDR
C
WP3D: Write to P3DDR
WP3: Write to Port 3
RP3: Read Port 3
n:
0 to 7
WP3
Mode 1, 2, 3,
or 4
Reset
P3n
R
Mode 7
QD
P3 n DR
C
WP3D
Mode 1, 2, 3, or 4
RP3
External address read
Figure C-3 Schematic Diagram of Port 3
Table C-3 Port 3 Port Read
Mode
1,2,3,4
7
DDR = 0
DDR = 1
Port Read Data
Always reads 1
Pin value
DR value
414