Table 15: External Interrupt Flag Register (Extint - 0Xe01Fc140) - Philips LPC2194 User Manual

Philips Semiconductors
ARM-based Microcontroller

Table 15: External Interrupt Flag Register (EXTINT - 0xE01FC140)

EXTINT Function
0 EINT0
1 EINT1
2 EINT2
3 EINT3
7:4 Reserved
External Interrupt Wakeup Register (EXTWAKE - 0xE01FC144)
Enable bits in the EXTWAKE register allow the external interrupts to wake up the processor if it is in Power Down mode. The
related EINTn function must be mapped to the pin in order for the wakeup process to take place. It is not necessary for the
interrupt to be enabled in the Vectored Interrupt Controller for a wakeup to take place. This arrangement allows additional
capabilities, such as having an external interrupt input wake up the processor from Power Down mode without causing an
interrupt (simply resuming operation), or allowing an interrupt to be enabled during Power Down without waking the processor
up if it is asserted (eliminating the need to disable the interrupt if the wakeup feature is not desirable in the application).
System Control Block
In level-sensitive mode, this bit is set if the EINT0 function is selected for its pin, and
the pin is in its active state. In edge-sensitive mode, this bit is set if the EINT0
function is selected for its pin, and the selected edge occurs on the pin.
Up to two pins can be selected to perform EINT0 function (see P0.1 and P0.16
description in "Pin Configuration" chapter.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin
is in its active state.
In level-sensitive mode, this bit is set if the EINT1 function is selected for its pin, and
the pin is in its active state. In edge-sensitive mode, this bit is set if the EINT1
function is selected for its pin, and the selected edge occurs on the pin.
Up to two pins can be selected to perform EINT1 function (see P0.3 and P0.14
description in "Pin Configuration" chapter.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin
is in its active state.
In level-sensitive mode, this bit is set if the EINT2 function is selected for its pin, and
the pin is in its active state. In edge-sensitive mode, this bit is set if the EINT2
function is selected for its pin, and the selected edge occurs on the pin.
Up to two pins can be selected to perform EINT2 function (see P0.7 and P0.15
description in "Pin Configuration" chapter.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin
is in its active state.
In level-sensitive mode, this bit is set if the EINT3 function is selected for its pin, and
the pin is in its active state. In edge-sensitive mode, this bit is set if the EINT3
function is selected for its pin, and the selected edge occurs on the pin.
Up to three pins can be selected to perform EINT3 function (see P0.9, P0.20 and
P0.30 description in "Pin Configuration" chapter.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin
is in its active state.
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
LPC2119/2129/2194/2292/2294
Description
70
Preliminary User Manual
Reset
Value
0
0
0
0
NA
May 03, 2004