Technical information

20
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
Fig. 16 Port block diagram (2)
Direction register
Port latch
Serial I/O enable bit
Transmit enable bit
P4
5 /T x D P-channel output disable bit
Pull-up control
(7) Port P45
Serial I/O output
Data bus
Direction register
Port latchData bus
Serial I/O ready output
Serial I/O mode selection bit
Pull-up control
(9) Port P47
(8) Port P46
Serial I/O clock-
synchronized selection bit
Serial I/O enable bit
Serial I/O mode selection bit
Serial I/O enable bit
Direction register
Port latch
Serial I/O clock output
Data bus
Serial I/O clock input
Pull-up control
(10) Ports P52, P53
Direction register
Port latchData bus
Pull-up control
Real time port control bit
Data for real time port
Direction register
Port latch
Data bus
Pull-up control
(12) Ports P55, P57
CNTR
1 interrupt input
A-D trigger interrupt input
(11) Port P54
Direction register
Port latchData bus
Pull-up control
Timer X operating mode bit
Timer output
CNTR
0 interrupt input
Serial I/O enable bit
S
RDY output enable bit
(Pulse output mode selection)