Technical information

16
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Fig. 6 Port block diagram (2)
Serial I/O2 output
Direction register
Port latchData bus
Pull-up control
Serial I/O1 ready output
(11) Port P5 1
(9) Port P4 7
Serial I/O1 mode selection bit
Serial I/O1 enable bit
Direction register
Port latchData bus
Pull-up control
S
RDY1 output enable bit
Serial I/O2 transmit completion signal
Serial I/O2 port selection bit
Direction register
Port latchData bus
Pull-up control
S
RDY2 output enable bit
Direction register
Port latch
Data bus
Pull-up control
Timer output
T
OUT output control bit
Serial I/O2 ready output
(10) Ports P5 0, P5 5
(12) Port P5 2
Direction register
Port latchData bus
Pull-up control
Serial I/O2 input
CNTR
1 interrupt input
Serial I/O2 clock output
Serial I/O2 clock input
Direction register
Port latch
Data bus
Pull-up control
Internal synchronization clock
select bits
Serial I/O2 port selection bit
Timer X operating mode bit
Timer output
CNTR
0 interrupt input
(Pulse output mode selection)
Direction register
Port latch
Data bus
Pull-up control
Real time port control bit
INT
3 interrupt input
Except P6
1
Data for real time port
Direction register
Port latch
Data bus
Pull-up control
(14) Port P5 4
(16) Ports P6 0 , P6 1
(15) Port P5 6
(13) Port P5 3