Extintn (External Interrupt Control Register N) - Samsung S3C2416 User Manual

S3C2416 RISC MICROPROCESSOR

3.14 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
EXTINT0
Reserved
EINT7
Reserved
EINT6
Reserved
EINT5
Reserved
EINT4
Reserved
Address R/W
0x56000088 R/W
0x5600008c R/W
Bit
[31] Reserved
[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
[27] Reserved
[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
[23] Reserved
[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
[19] Reserved
[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
[15] Reserved
Description
External interrupt control register 0
External interrupt control register 1
Description
I/O PORTS
Reset Value
0x0
0x0
10-31