參數(shù)資料
型號: M3823AGF-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù): 21/76頁
文件大小: 896K
代理商: M3823AGF-XXXHP
Rev.2.02
Jun 19, 2007
page 28 of 73
REJ03B0146-0202
3823 Group
Key Input Interrupt (Key-on wake-up)
A Key-on wake-up interrupt request is generated by applying a
falling edge to any pin of port P2 that have been set to input mode.
In other words, it is gener1ated when AND of input level goes from
“1” to “0”. An example of using a key input interrupt is shown in
Figure 21, where an interrupt request is generated by pressing
one of the keys consisted as an active-low key matrix which inputs
to ports P20–P23.
Fig. 21 Connection example when using key input interrupt and port P2 block diagram
Port PXX
“L” level output
Port P27
direction register = “1”
P27 output
P26 output
PULL register A bit 2 = “1”
P25 output
P24 output
P23 input
Port P26
latch
Port P25
latch
Port P24
latch
Port P23
latch
Port P27
latch
Port P25
direction register = “1”
Port P24
direction register = “1”
Port P23
direction register = “0”
P22 input
P21 input
P20 input
Port P22
latch
Port P21
latch
Port P20
latch
Port P22
direction register = “0”
Port P21
direction register = “0”
Port P20
direction register = “0”
Port P2
Input reading circuit
P-channel transistor for pull-up
CMOS output buffer
Key input interrupt request
Port P26
direction register = “1”
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