參數(shù)資料
型號： M38C12M4-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 13/59頁
文件大?。?/td> 704K
代理商： M38C12M4-XXXFP
Rev.2.40
Jun 14, 2004
page 20 of 56
38C1 Group
Key Input Interrupt (Key-on Wake Up)
A Key-on wake up interrupt request is generated by applying “L”
level voltage 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 17, 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. 17 Connection example when using key input control register, key input interrupt and port P3 block diagram
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”
P30 input
P31 input
P32 input
P33 input
P34 output
PULL register
Bit 3 = “1”
Port P3
input read circuit
Port PXx
“L” level output
Key input interrupt request
P-channel transistor for pull-up
CMOS output buffer
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