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Philips Semiconductors
User’s Manual - Preliminary -
P89LPC901/902/903
INTERRUPTS
2003 Dec 8 37
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) .
Figure 3-1: Interrupt sources, enables, and Power down Wake-up sources - P89LPC901
Wakeup (if in
Power down)
EA (IE0.7)
Interrupt to CPU
BOPD
EBO
KBIF
EKBI
EC
WDOVF
EWDRT
TF0
ET0
TF1
ET1
CMF
ERTC
(RTCCON.1)
RTCF