
13
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C3 Group
Fig. 11 Port block diagram (2)
(7)Port P4
5
Data bus
Serial I/O port selection bit
Serial I/O output
P-channel output disable bit
Port latch
Direction register
Pull-up control
(9)Port P4
7
Data bus
Serial I/O ready output
Port latch
S
RDY
output enable bit
Direction register
Pull-up control
(8)Port P4
6
Serial I/O clock output
Serial I/O clock input
Serial I/O mode selection bit
Port latch
Direction register
Pull-up control
P-channel output disable bit
(10)Port P5
0
Data bus
Port latch
Direction register
Pull-up control
Timer A output enable bit
Timer A output
(12)Ports P5
3
–P5
7
INT
0
–INT
2
interrupt input
Data bus
Direction register
Port latch
Pull-up control
(11)Port P5
1
Data bus
(Note)
Note: The initihal value of M version becomes “1” (output).
Data bus
CNTR
0
,CNTR
1
interrupt input
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