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| 型号： | M38748EAF-XXXFS |
| 厂商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 29/92页 |
| 文件大小： | 1292K |
| 代理商： | M38748EAF-XXXFS |
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29
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Key Input Interrupt
A Key input interrupt request is generated by applying “L” level 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 21,
where an interrupt request is generated by pressing one of the
keys consisted as an active-low key matrix which inputs to ports
P2
0
–P2
4
.
Fig. 21 Connection example when using key input interrupt and port P2 block diagram
8
88
8
88
8
88
8
88
8
88
8
88
8
88
8
88
Port P2
0
latch
Port P2
direction register = “0”
Port P2
1
latch
Port P2
1
direction register = “0”
Port P2
2
latch
Port P2
2
direction register = “0”
Port P2
3
latch
Port P2
direction register = “0”
Port P2
4
latch
Port P2
4
direction register = “0”
Port P2
5
latch
Port P2
5
direction register = “1”
Port P2
6
latch
Port P2
6
direction register = “1”
Port P2
7
latch
Port P2
7
direction register = “1”
P2
0
input
P2
1
input
P2
2
input
P2
3
input
P2
4
input
P2
5
output
P2
6
output
P2
7
output
PULL UP register
Bit 0 = “0”
Port P2
Input reading circuit
Key input interrupt request
Port PXx
“L” level output
8
P-channel transistor for pull-up
88
CMOS output buffer
PULL UP register
Bit 1 = “0”
PULL UP register
Bit 2 = “1”
PULL UP register
Bit 3 = “1”
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| M38748EAF-XXXGP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EDD-XXXFS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EDD-XXXGP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EDF-XXXFS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EDF-XXXGP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M38748EAF-XXXGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EAT-XXXFS | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EAT-XXXGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EBD-XXXFS | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38748EBD-XXXGP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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