參數(shù)資料
型號(hào)： M38220MC-FP
廠(chǎng)商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 17/78頁(yè)
文件大?。?/td> 998K
代理商： M38220MC-FP
24
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
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 generated when AND of input level goes from
“1” to “0”. An example of using a key input interrupt is shown in
Figure 20, 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. 20 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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