參數(shù)資料
型號: M37513EFFS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, UVPROM, 4 MHz, MICROCONTROLLER, CQCC100
封裝: WINDOWED, CERAMIC, LCC-100
文件頁數(shù): 19/68頁
文件大?。?/td> 1010K
代理商: M37513EFFS
23
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7513 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 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 P27
latch
Port P27
direction register = “1”
Port P20
input
Port P21
input
Port P22
input
Port P23
input
Port P24 output
Port P25 output
Port P26 output
Port P27 output
PULLA register
Bit 2 = “1”
Port P2 input
reading circuit
Key input interrupt request
Port PXx
“L” level output
P-channel transistor for pull-up
CMOS output buffer
Key input control register = “1”
Port P26
direction register = “1”
Key input control register = “1”
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