參數(shù)資料
型號： M38203E4HP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝： 0.50 MM PITCH, PLASTIC, QFP-80
文件頁數(shù)： 14/67頁
文件大小： 1099K
代理商： M38203E4HP
20
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Key Input Interrupt (Key-on Wake Up)
A key input interrupt request is generated by applying “L” level 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 9,
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. 10 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
V P-channel transistor for pull-up
V V CMOS output buffer
Key input interrupt request
V
VV
V
VV
V
VV
V
VV
V
VV
V
VV
V
VV
V
VV
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