GMS81508A Datasheet, PDF (31/91 Pages) Hynix Semiconductor – USERS MANUAL

HYUNDAI MicroElectronics
2.7. EXTERNAL INTERRUPT
An interrupt request is generated when a level-change from "H" to "L" or "L" to "H" of
INT0,INT1,INT2,INT3 pin is detected. The edge of external interrupt is selected by interrupt edge
selection register(IEDS) and ports(R40,R41,R42,R43) corresponding to INT0,INT1,INT4,INT3 are
determined as a input port for external interrupt by bit0~3 of port4 mode register(PMR4).
PMR4
<00D0_H>
W
W
W
W
W
W
W
W
7
6
5
4
3
2
1
0
T3S T1S EC2S EC0S INT3S INT2S INT1S INT0S
R43 / INT3 Selection
0 : R43 ( Input / Output )
1 : INT3 ( Input )
R42 / INT1 Selection
0 : R42 ( Input / Output )
1 : INT2 ( Input )
R40 / INT0 Selection
0 : R40 ( Input / Output )
1 : INT0 ( Input )
R41 / INT1 Selection
0 : R41 ( Input / Output )
1 : INT1 ( Input )

EXT. INTERRUPT EDGE SELECTION REGISTER
IEDS
<00F8_H>
W
W
W
W
W
W
W
W
7
6
5
4
3
2
1
0
IED3H IED3L IED2H IED2L IED1H IED1L IED0H IED0L
INT3 Edge Selection
00 : -
01 : Falling
10 : Rising
11 : Falling & Rising
INT2 Edge Selection
00 : -
01 : Falling
10 : Rising
11 : Falling & Rising
INT1 Edge Selection
00 : -
01 : Falling
10 : Rising
11 : Falling & Rising
INT0 Edge Selection
00 : -
01 : Falling
10 : Rising
11 : Falling & Rising
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