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I/O PORTS S3C2410A
9-22
EXTERNAL INTERRUPT CONTROL REGISTER (EXTINTn)
The 24 external interrupts can be requested by various signaling methods. The EXTINTn configures the signaling
method between the level trigger and edge trigger for the external interrupt request, and also configures the signal
polarity.
To recognize the level interrupt, the valid logic level on EXTINTn pin must be retained at least for 40ns because of the
noise filter (EINT[15:0]).
Register Address R/W Description Reset Value
EXTINT0 0x56000088 R/W External interrupt control register 0 0x0
EXTINT1 0x5600008C R/W External interrupt control register 1 0x0
EXTINT2 0x56000090 R/W External interrupt control register 2 0x0
EXTINT0 Bit Description
EINT7 [30:28] Set the signaling method of the EINT7.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT6 [26:24] Set the signaling method of the EINT6.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT5 [22:20] Set the signaling method of the EINT5.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT4 [18:16] Set the signaling method of the EINT4.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT3 [14:12] Set the signaling method of the EINT3.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT2 [10:8] Set the signaling method of the EINT2.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT1 [6:4] Set the signaling method of the EINT1.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
EINT0 [2:0] Set the signaling method of the EINT0.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered