Hitachi H8/500 Series - Port 4 Port Read

C.4 Schematic Diagram of Port 4
Figure C-4 gives a schematic view of the port 4 input/output circuits.
Table C-4 Port 4 Port Read
Mode Port Read Data
1,2,3,4 DR value
DDR = 0 Pin value
DDR = 1 DR value
WP4D:
WP4:
RP4:
n:
Write to P4DDR
Write to Port 4
Read Port 4
0 to 7
Internal data bus (PDB8 to PDB15)
Mode 1, 2, 3, or 4
Software standby
Bus release
Mode 7
Mode 1, 2, 3, or 4
RP4
P4n
WP4
C
R
QD
P4 DR
n
C
R
QD
P4 DDR
n
Reset
WP4D
Reset
S
Internal address bus (IAB0 to IAB7)
7
Figure C-4 Schematic Diagram of Port 4
415
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