參數(shù)資料
型號： M37531RSS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 8 MHz, MICROCONTROLLER, CDIP42
封裝： SHRINK, CERAMIC, PIGGY BACK, DIP-42
文件頁數(shù)： 10/76頁
文件大小： 1022K
代理商： M37531RSS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7531 Group
MITSUBISHI MICROCOMPUTERS
18
Key Input Interrupt (Key-On Wake-Up)
A key-on wake-up interrupt request is generated by applying “L” level
to any pin of port P0 that has been set to input mode.
In other words, it is generated when the AND of input level goes from
“1” to “0”. An example of using a key input interrupt is shown in Fig-
ure 19, where an interrupt request is generated by pressing one of
the keys provided as an active-low key matrix which uses ports P00
to P04 as input ports.
Port PXx
“L” level output
PULL register
bit 3 = “0”
Port P07
latch
Port P07
Direction register = “1”
**
*
P07 output
Key input interrupt request
Port P0
Input read circuit
* P-channel transistor for pull-up
** CMOS output buffer
PULL register
bit 3 = “0”
Port P06
latch
Port P06
Direction register = “1”
**
*
P06 output
PULL register
bit 3 = “0”
Port P05
latch
Port P05
Direction register = “1”
**
*
P05 output
PULL register
bit 3 = “1”
Port P04
latch
Port P04
Direction register = “0”
**
*
P04 input
PULL register
bit 2 = “1”
Port P03
latch
Port P03
Direction register = “0”
**
*
P03 input
PULL register
bit 2 = “1”
Port P02
latch
Port P02
Direction register = “0”
**
*
P02 input
PULL register
bit 1 = “1”
Port P01
latch
Port P01
Direction register = “0”
**
*
P01 input
PULL register
bit 0 = “1”
Port P00
latch
Port P00
Direction register = “0”
**
*
P00 input
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Fig. 19 Connection example when using key input interrupt and port P0 block diagram
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相關代理商/技術參數(shù)
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