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MC81F4204D Datasheet(PDF) 82 Page - Finechips

Part No. MC81F4204D
Description  ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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Manufacturer  FINECHIPS [Finechips]
Direct Link  http://www.finechips.com
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MC81F4204D Datasheet(HTML) 82 Page - Finechips

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MC81F4204
82
October 19, 2009 Ver.1.35
12. EXTERNAL INTERRUPTS
The external interrupt pins are
edge triggered depending on the „external interrupt registers‟.
The edge detection of external interrupt has three transition activated mode: rising edge, falling edge,
and both edge.
12.1 Registers
EINT0H
– EXT 2~5 / R04~R07
R0 PORT EXTERNAL INTERRUPT ENABLE HIGH REGISTER
00CAH
A reset clears the EINT0H register to
„00H‟, disables EXT5-EXT2 interrupt. You can use EINT0H
register setting to select Disable interrupt or Enable interrupt (by falling, rising, or both falling and
rising edge).
7
6
5
4
3
2
1
0
EINT0H
EXT5IE
EXT4IE
EXT3IE
EXT2IE
Reset value: 00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EXT5IE
R07/EXT5 External Interrupt Enable Bits
00: Disable Interrupt
01: Enable Interrupt by falling edge
10: Enable Interrupt by rising edge
11: Enable Interrupt by both falling and
rising edge
EXT4IE
R06/EXT4 External Interrupt Enable Bits
EXT3IE
R05/EXT3 External Interrupt Enable Bits
EXT2IE
R04/EXT2 External Interrupt Enable Bits


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