HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 423

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

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
1,2,3,4
7
DDR = 0
DDR = 1
P3
n
Mode 1, 2, 3, or 4
Port Read Data
Always reads 1
Pin value
DR value
Figure C-3 Schematic Diagram of Port 3
External address read
Mode 1, 2, 3, or 4
Mode 1, 2, 3,
or 4
Mode 7
414
Data bus control
Mode 7
RP3
Q
P3 DDR
Q
WP3
P3 DR
WP3D
n
Reset
C
Reset
C
n
R
R
D
D
WP3D:
WP3:
RP3:
n:
Write to P3DDR
Write to Port 3
Read Port 3
0 to 7