Interrupt Wakeup Register (Intwake - 0Xe01F C144) - Philips LPC214 Series User Manual

Philips Semiconductors
Volume 1
Table 9: External Interrupt Flag register (EXTINT - address 0xE01F C140) bit description
Bit Symbol Description
0 EINT0 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 the EINT0 function (see P0.1 and P0.16 description in
"Pin Configuration" chapter page 66.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin is in its active
state (e.g. if EINT0 is selected to be low level sensitive and a low level is present on the
corresponding pin, this bit can not be cleared; this bit can be cleared only when the signal on the
pin becomes high).
1 EINT1 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 the EINT1 function (see P0.3 and P0.14 description in
"Pin Configuration" chapter on page 66.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin is in its active
state (e.g. if EINT1 is selected to be low level sensitive and a low level is present on the
corresponding pin, this bit can not be cleared; this bit can be cleared only when the signal on the
pin becomes high).
2 EINT2 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 the EINT2 function (see P0.7 and P0.15 description in
"Pin Configuration" chapter on page 66.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin is in its active
state (e.g. if EINT2 is selected to be low level sensitive and a low level is present on the
corresponding pin, this bit can not be cleared; this bit can be cleared only when the signal on the
pin becomes high).
3 EINT3 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 the EINT3 function (see P0.9, P0.20 and P0.30
description in "Pin Configuration" chapter on page 66.)
This bit is cleared by writing a one to it, except in level sensitive mode when the pin is in its active
state (e.g. if EINT3 is selected to be low level sensitive and a low level is present on the
corresponding pin, this bit can not be cleared; this bit can be cleared only when the signal on the
pin becomes high).
7:4 - Reserved, user software should not write ones to reserved bits. The value read from a reserved
bit is not defined.

3.5.3 Interrupt Wakeup register (INTWAKE - 0xE01F C144)

Enable bits in the INTWAKE register allow the external interrupts and other sources 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).
User manual Rev. 01 — 15 August 2005
UM10139
Chapter 3: System Control Block
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Reset
value
0
0
0
0
NA
22