Samsung S3C2451X User Manual page 292

I/O PORTS
EXTINTn (External Interrupt Control Register n)
The 8 external interrupts can be requested by various Signalling methods. The EXTINT register configures the
Signalling 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
EXTINT0
EXTINT1
EXTINT2
EXTINT0
FLTEN7
EINT7
FLTEN6
EINT6
FLTEN5
EINT5
FLTEN4
EINT4
FLTEN3
EINT3
FLTEN2
11-36
Address R/W
0x56000088 R/W
0x5600008c R/W
0x56000090 R/W
Bit
[31] Filter enable for EINT7
0 = Filter Enable
[30:28] Setting the signalling method of the EINT7.
000 = Low level
10x = Rising edge triggered
[27] Filter enable for EINT6
0 = Filter Enable
[26:24] Setting the signalling method of the EINT6.
000 = Low level
10x = Rising edge triggered
[23] Filter enable for EINT5
0 = Filter Enable
[22:20] Setting the signalling method of the EINT5.
000 = Low level
10x = Rising edge triggered
[19] Filter enable for EINT4
0 = Filter Enable
[18:16] Setting the signalling method of the EINT4.
000 = Low level
10x = Rising edge triggered
[15] Filter enable for EINT3
0 = Filter Enable
[14:12] Setting the signalling method of the EINT3.
000 = Low level
10x = Rising edge triggered
[11] Filter enable for EINT2
0 = Filter Enable
Description
External interrupt control register 0
External interrupt control register 1
External interrupt control register 2
Description
1= Filter Disable
001 = High level
1= Filter Disable
001 = High level
1= Filter Disable
001 = High level
1= Filter Disable
001 = High level
1= Filter Disable
001 = High level
1= Filter Disable
S3C2451X RISC MICROPROCESSOR
Reset Value
01x = Falling edge triggered
11x = Both edge triggered
01x = Falling edge triggered
11x = Both edge triggered
01x = Falling edge triggered
11x = Both edge triggered
01x = Falling edge triggered
11x = Both edge triggered
01x = Falling edge triggered
11x = Both edge triggered
0x0
0x0
0x0