參數(shù)資料
型號： M37532
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 8 Bits CMOS Microcomputer(8位單片機(jī))
中文描述： 單芯片的CMOS 8位單片機(jī)（8位單片機(jī)）
文件頁數(shù)： 17/50頁
文件大?。?/td> 524K
代理商： M37532
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7532 Group
MITSUBISHI MICROCOMPUTERS
17
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 17, where an interrupt request is generated by pressing one of
the keys provided as an active-low key matrix which uses ports P0
0
to P0
3
as input ports.
Fig. 17 Connection example when using key input interrupt and port P0 block diagram
Port PXx
“L” level output
PULL register
bit 3 = “0”
Port P0
7
latch
Port P0
7
Direction register = “1”
**
*
P0
7
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 P0
6
latch
Port P0
6
Direction register = “1”
**
*
P0
6
output
PULL register
bit 3 = “0”
Port P0
5
latch
Port P0
5
Direction register = “1”
**
*
P0
5
output
PULL register
bit 3 = “0”
Port P0
4
latch
Port P0
4
Direction register = “1”
**
*
P0
4
output
PULL register
bit 2 = “1”
Port P0
3
latch
Port P0
3
Direction register = “0”
**
*
P0
3
input
PULL register
bit 2 = “1”
Port P0
2
latch
Port P0
2
Direction register = “0”
**
*
P0
2
input
PULL register
bit 1 = “1”
Port P0
1
latch
Port P0
1
Direction register = “0”
**
*
P0
1
input
PULL register
bit 0 = “1”
Port P0
0
latch
Port P0
0
Direction register = “0”
**
*
P0
0
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
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