MC81F4204 Datasheet, PDF (82/150 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

MC81F4204
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
EXT4IE R06/EXT4 External Interrupt Enable Bits ^{01: Enable Interrupt by falling edge}
EXT3IE
EXT2IE
R05/EXT3 External Interrupt Enable Bits
R04/EXT2 External Interrupt Enable Bits
10: Enable Interrupt by rising edge
11: Enable Interrupt by both falling and
rising edge
82
October 19, 2009 Ver.1.35