參數(shù)資料
型號: M38223M4-XXXGP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: 14 X 14 MM, 0.65 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 18/80頁
文件大?。?/td> 1329K
代理商: M38223M4-XXXGP
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”
相關(guān)PDF資料
PDF描述
M38223M4MXXXGP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80
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