Technical information

15
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Fig. 5 Port block diagram (1)
(3)Ports P3 0 –P3 7
V L2 /V L3
V L1 /V SS
(1)Ports P0,P1
Segment output enable bit
V
L2 /V L3
V L1 /V SS
(Note)
(5)Port P4 1
Data bus
Pull-down control
Segment output enable bit
Data bus
Direction register
Port latch
Pull-down control
Segment output enable bit
Note. Bit 0 of port P0 direction register and
port P1 direction register.
φ
φ output control bit
Direction register
Pull-up control
Data bus
Port latch
Direction register
Pull-up control
Data bus
Port latch
Direction register
Pull-up control
Data bus
Port latch
(7)Port P4 5
Serial I/O1 output
Serial I/O1 enable bit
Transmission enable bit
V
L2 /V L3
P4 5 /T X D P-channel output disable bit
(6)Port P4 4
(4)Port P4 0
(2)Ports P2,P4 2 ,P4 3 ,P5 7
Direction register
Direction register
Data bus Port latch
Pull-up control
Key input (Key-on wake up) interrupt input
INT
0 –INT 2 interrupt input
Pull-up control
Reception enable bit
Serial I/O1 enable bit
Serial I/O1 input
Data bus Port latch
Data bus
(8)Port P4 6
Serial I/O1 clock input
Direction register
Pull-up control
Data bus
Port latch
Serial I/O1 clock output
Serial I/O1 mode selection bit
Serial I/O1 enable bit
Serial I/O1 synchronization clock
selection bit
Serial I/O1 enable bit