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| 型號： | M37534RSS |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 18/55頁 |
| 文件大?。?/td> | 610K |
| 代理商： | M37534RSS |
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7534 Group
Rev.2.00 Jun 21, 2004 page 18 of 54
REJ03B0099-0200Z
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 18, 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. 18 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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