HD6475328-CP10 Datasheet, PDF (424/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

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