MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(9) Port P45
P45/TXD P-channel output disable bit
Serial I/O1 enable bit
Transmit enable bit
Direction register
Data bus
Port latch
Serial I/O1 output
(11) Port P47
Serial I/O1 mode selection bit
Serial I/O1 enable bit
SRDY1 output enable bit
Direction register
Data bus
Port latch
Serial I/O1 ready output
(13) Ports P54,P55
Direction register
Data bus
Port latch
(10) Port P46
Serial I/O1 synchronous
clock selection bit
Serial I/O1 enable bit
Serial I/O1mode selection bit
Serial I/O1enable bit
Direction register
Data bus
Port latch
Serial I/O1 clock output
Serial I/O1 external clock input
(12) Port P50
Direction register
Data bus
Port latch
TOUT output control bit
Timer 2 output
(14) Ports P56,P57,P80,P81
Direction register
Data bus
Port latch
Timer X, Timer Y
operating mode bits
"001"
"100"
"101"
"110"
Timer output
CNTR0, CNTR1 interrupt input
D-A conversion output
DA1 output enable bit (P56)
DA2 output enable bit (P57)
DA3 output enable bit (P80)
DA4 output enable bit (P81)
A-D conversion input
Analog input pin selection bit
except P56,P57
(15) Ports P60—P62,P74—P77
Direction register
(16) Ports P63,P64
Data bus
Port latch
A-D conversion input
Analog input pin selection bit
Fig. 11. Port block diagram (2)
Data bus
A-D conversion input
Analog input pin selection bit
Analog comparator input
14