參數(shù)資料
型號(hào): M38257E8FP
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁(yè)數(shù): 19/73頁(yè)
文件大?。?/td> 1323K
代理商: M38257E8FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3825 Group
23
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 18, 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. 18 Connection example when using key input interrupt and port P2 block diagram
Port P20
latch
Port P20
direction register = “0”
Port P21
latch
Port P21
direction register = “0”
Port P22
latch
Port P22
direction register = “0”
Port P23
latch
Port P23
direction register = “0”
Port P24
latch
Port P24
direction register = “1”
Port P25
latch
Port P25
direction register = “1”
Port P26
latch
Port P26
direction register = “1”
Port P27
latch
Port P27
direction register = “1”
P20 input
P21 input
P22 input
P23 input
P24 output
P25 output
P26 output
P27 output
PULL register A
Bit 2 = “1”
Port P2
Input reading circuit
Port PXx
“L” level output
P-channel transistor for pull-up
CMOS output buffer
Key input interrupt request
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