Samsung S3C2440A - Manual (Page 273)

S3C2440A RISC MICROPROCESSOR I/O PORTS
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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