M38866E2HP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC
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M38866E2HP Datasheet PDF : 110 Pages
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MITSUBISHI MICROCOMPUTERS
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Key Input Interrupt (Key-on Wake Up)
A Key input interrupt request is generated by applying “L” level to
any pin of port P3 that have been set to input mode. In other
words, it is generated when AND of input level goes from “1” to
“0”. An example of using a key input interrupt is shown in Figure
18, where an interrupt request is generated by pressing one of the
keys consisted as an active-low key matrix which inputs to ports
P30–P33.
Port PXx
“L” level output
P37 output
Port control register 1
Bit 5 = “1”
Port P37
direction register = “1”
T
TT Port P37
latch
T
P36 output
Port P36
direction register = “1”
TT Port P36
latch
T
P35 output
T
P34 output
Port P35
direction register = “1”
TT Port P35
latch
Port P34
direction register = “1”
TT Port P34
latch
P33 input
Port control register 1
Port P33
Bit 4 = “1”
direction register = “0”
T
TT Port P33
latch
Key input interrupt request
Port P3
Input reading circuit
Comparator circuit
T
P32 input
Port P32
direction register = “0”
TT Port P32
latch
T
P31 input
Port P31
direction register = “0”
TT Port P31
latch
T
P30 input
Port P30
direction register = “0”
TT Port P30
latch
T P-channel transistor for pull-up
TT CMOS output buffer
Fig. 18 Connection example when using key input interrupt and port P3 block diagram
23
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