HD6475328-CP10 Datasheet, PDF (433/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

C.9 Schematic Diagram of Port 9
Figure C-9 (a) to (e) gives a schematic view of the port 9 input/output circuits.
Reset
R
Q
D
P9 n DDR
C
WP9D
Reset
WP9D: Write to P9DDR
WP9: Write to Port 9
RP9: Read Port 9
n:
0 or 1
R
P9n
Q
D
P9 n DR
C
WP9
Free-running timer module
Output enable
Output compare output
RP9
Figure C-9 (a) Schematic Diagram of Port 9, Pins P90 and P91
Table C-9 (a) Port 9 Port Read (Pins P90, P91)
Setting
Output enable
Output disable
DDR = 0
DDR = 1
Port Read Data
Output compare output value
Pin value
DR value
424