Hitachi H8/500 Series - Port 3 Port Read

C.3 Schematic Diagram of Port 3
Figure C-3 gives a schematic view of the port 3 input/output circuits.
Table C-3 Port 3 Port Read
Mode Port Read Data
1,2,3,4 Always reads 1
DDR = 0 Pin value
DDR = 1 DR value
Internal data bus (PDB8 to PDB15)
WP3D:
WP3:
RP3:
n:
Write to P3DDR
Write to Port 3
Read Port 3
0 to 7
WP3D
C
R
QD
P3 DR
n
C
R
QD
P3 DDR
n
Reset
WP3
Reset
Data bus control
External address read
Mode 7
RP3
Mode 7
Mode 1, 2, 3, or 4
Mode 1, 2, 3, or 4
Mode 1, 2, 3,
or 4
P3
n
7
Figure C-3 Schematic Diagram of Port 3
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