Technical information

13
MITSUBISHI MICROCOMPUTERS
3806 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Fig. 4 Port block diagram (single-chip mode) (1)
(1) Ports P0, P1, P2, P3, P40, P41, P50, P8
Direction register
Data bus
Port latch
(2) Ports P42, P43, P51, P52, P53
Direction register
Data bus
Port latch
Interrupt input
(3) Port P44
Direction register
Data bus
Port latch
Serial I/O1 input
Serial I/O1 enable bit
Receive enable bit
(4) Port P45
Direction register
Data bus
Port latch
Serial I/O1output
Serial I/O1 enable bit
Transmit enable bit
P45/TXD P-channel output disable bit
(5) Port P46
Direction register
Data bus
Port latch
Serial I/O1 clock output
Serial I/O1 mode selection bit
Serial I/O1 enable bit
Serial I/O1 enable bit
Serial I/O1
synchronous clock selection bit
Serial I/O1
external
clock input
(6) Port P47
Direction register
Data bus
Port latch
Serial I/O1 ready output
Serial I/O1 enable bit
S
RDY1 output enable bit
Serial I/O1 mode selection bit
(7) Ports P54, P55
Direction register
Data bus
Port latch
(8) Ports P56, P57
Direction register
Data bus
Port latch
D-A conversion output
Pulse output mode
Timer output
Counter input
Interrupt input
DA1 output enable bit (P56)
DA
2 output enable bit (P57)