Preliminary
I/O PORTS
S3C2451X RISC MICROPROCESSOR
11-36
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 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
FLTEN7
[31]
Filter enable for EINT7
0 = Filter Enable
1= Filter Disable
EINT7
[30:28]
Setting the signalling method of the EINT7.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
FLTEN6
[27]
Filter enable for EINT6
0 = Filter Enable
1= Filter Disable
EINT6 [26:24]
Setting
the
ٛ
signalling method of the EINT6.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
FLTEN5
[23]
Filter enable for EINT5
0 = Filter Enable
1= Filter Disable
EINT5
[22:20]
Setting the signalling method of the EINT5.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
FLTEN4
[19]
Filter enable for EINT4
0 = Filter Enable
1= Filter Disable
EINT4
[18:16]
Setting the signalling method of the EINT4.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
FLTEN3
[15]
Filter enable for EINT3
0 = Filter Enable
1= Filter Disable
EINT3
[14:12]
Setting the signalling method of the EINT3.
000 = Low level 001 = High level 01x = Falling edge triggered
10x = Rising edge triggered 11x = Both edge triggered
FLTEN2
[11]
Filter enable for EINT2
0 = Filter Enable
1= Filter Disable