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S3C2440A RISC MICROPROCESSOR I/O PORTS

9-27

EXTINTn(External Interrupt Control Register n)

The 8 external interrupts can be requested by various signaling methods. The EXTINT register 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 for 40ns at least because of

the noise filter.

Register Address R/W Description Reset Value

EXTINT0 0x56000088 R/W External Interrupt control Register 0 0x000000

EXTINT1 0x5600008c R/W External Interrupt control Register 1 0x000000

EXTINT2 0x56000090 R/W External Interrupt control Register 2 0x000000

EXTINT0 Bit Description

EINT7 [30:28] Setting 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] Setting 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] Setting 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] Setting 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] Setting 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] Setting 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] Setting 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] Setting the signaling method of the EINT0.

000 = Low level 001 = High level 01x = Falling edge triggered

10x = Rising edge triggered 11x = Both edge triggered