MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(1) Ports P0, P1
(2) Ports P2, P42, P43, P50, P51
V
L2/VL3
Pull-up control
V
L1/VSS
Segment output enable bit
(Note)
Direction register
Direction register
Data bus
Port latch
Data bus
Port latch
Key input (Key-on wake-up) interrupt input
INT –INT interrupt input
0
3
Pull-down control
Segment output enable bit
Note: Bit 0 of direction register.
(3) Ports P34–P37
(4) Port P4
0
VL2/VL3
Data bus
V
L1/VSS
Data bus
Pull-down control
Segment output enable bit
(6) Port P4
4
(5) Port P4
1
Pull-up control
Pull-up control
Serial I/O enable bit
Receive enable bit
Direction register
Direction register
Port latch
Data bus
Data bus
Port latch
φ output control bit
φ
Serial I/O input
Fig. 15 Port block diagram (1)
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MITSUBISHI [ Mitsubishi Group ]
