參數(shù)資料
型號: M38869MFA-XXXGP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP80
封裝: 0.65 MM PITCH, PLASTIC, QFP-80!
文件頁數(shù): 33/113頁
文件大?。?/td> 1871K
代理商: M38869MFA-XXXGP
23
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
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.
Fig. 18 Connection example when using key input interrupt and port P3 block diagram
T
TT
T
TT
T
TT
T
TT
T
TT
T
TT
T
TT
T
TT
Port P30
latch
Port P30
direction register = “0”
Port P31
latch
Port P31
direction register = “0”
Port P32
latch
Port P32
direction register = “0”
Port P33
latch
Port P33
direction register = “0”
Port P34
latch
Port P34
direction register = “1”
Port P35
latch
Port P35
direction register = “1”
Port P36
latch
Port P36
direction register = “1”
Port P37
latch
Port P37
direction register = “1”
P30 input
P31 input
P32 input
P33 input
P34 output
P35 output
P36 output
P37 output
Port control register 1
Bit 5 = “1”
Port P3
Input reading circuit
Comparator circuit
Port PXx
“L” level output
T P-channel transistor for pull-up
TT CMOS output buffer
Key input interrupt request
Port control register 1
Bit 4 = “1”
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