15
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3827 Group
Fig. 11 Port block diagram (2)
(6) Port P4
5
(7) Port P4
6
Serial I/O1 clock
selection bit
Serial I/O1 enable bit
(8) Port P4
7
Data bus
Serial I/O1 enable bit
Transmission enable bit
Serial I/O1 output
P4
5
/TxD P-channel output disable bit
Port latch
Direction register
Pull-up control
Serial I/O1 ready output
Data bus
Port latch
Serial I/O1 mode selection bit
Serial I/O1 enable bit
S
RDY1
output enable bit
Direction register
Pull-up control
(9) Ports P5
2
, P5
3
Data bus
Port latch
Real time control bit
Real time port data
Direction register
Pull-up control
Data bus
Serial I/O1 clock outupt
Serial I/O1 clock input
Serial I/O1 mode selection bit
Serial I/O1 enable bit
Port latch
Direction register
Pull-up control
(10) Ports P5
0
,P5
1
Data bus
Port latch
PWM function enable bit
PWM output
Direction register
Pull-up control
(11) Port P5
4
Port latch
Data bus
Pulse output mode
Timer output
CNTR
0
interrupt input
Direction register
Pull-up control