External Interrupt Inputs; External Interrupt Pin Glitch Suppression; Interrupt Sources, Enables, And Power Down Wake-Up Sources - P89Lpc901 - Philips P89LPC902 User Manual

Philips Semiconductors
INTERRUPTS

External Interrupt Inputs

The P89LPC901/902/903 have a Keypad Interrupt function (see Keypad Interrupt (KBI) on page 79). This can be used as an
external interrupt input. If enabled when the P89LPC901/902/903 is put into Power down or Idle mode, the keypad interrupt will
cause the processor to wake up and resume operation. Refer to the section on Power Reduction Modes for details.

External Interrupt Pin Glitch Suppression

Most of the P89LPC901/902/903 pins have glitch suppression circuits to reject short glitches (please refer to the P89LPC901/
902/903 datasheet, AC Electrical Characteristics for glitch filter specifications) .
RTCF
ERTC
(RTCCON.1)
WDOVF
Figure 3-1: Interrupt sources, enables, and Power down Wake-up sources - P89LPC901
2003 Dec 8
BOPD
EBO
KBIF
EKBI
EWDRT
CMF
EC
EA (IE0.7)
TF1
ET1
TF0
ET0
37
User's Manual - Preliminary -
P89LPC901/902/903
Wakeup (if in
Power down)
Interrupt to CPU