Philips P89LPC908 用户手册

2003 Dec 8     

32

The P89LPC906/907/908 have a Keypad Interrupt function (see Keypad Interrupt (KBI) on page 77). This can be used as an 
external interrupt input. If enabled when the P89LPC906/907/908 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. 

Most of the P89LPC906/907/908 pins have glitch suppression circuits to reject short glitches (please refer to the P89LPC906/
907/908 datasheet, AC Electrical Characteristics for glitch filter specifications) .

Timer 0 Interrupt

TF0

000Bh

ET0 (IEN0.1)

IP0H.1, IP0.1

3

No

Timer 1 Interrupt

TF1

001Bh

ET1 (IEN0.3)

IP0H.3, IP0.3

5

No

Serial Port Tx and Rx

TI & RI

0023h

ES/ESR 
(IEN0.4)

IP0H.4, IP0.4

8

No

Serial Port Rx

RI

Brownout Detect

BOF

002Bh

EBO (IEN0.5)

IP0H.5, IP0.5

1

Yes

Watchdog Timer/Real-
time Clock

WDOVF/

RTCF

0053h

EWDRT 
(IEN0.6)

IP0H.6, IP0.6

2

Yes

KBI Interrupt

KBIF

003Bh

EKBI (IEN1.1)

IP1H.1, IP1.1

4

Yes

Comparator interrupt

CMF

0043h

EC (IEN1.2)

IP1H.2, IP1.2

6

Yes

Serial Port Tx

TI

006Bh

EST (IEN1.6)

P1H.6, IP1.6

7

No

1. SSTAT.5 = 0 selects combined Serial Port (UART) Tx and Rx interrupt; SSTAT.5 = 1 selects Serial Port Rx interrupt only 

(Tx interrupt will be different, see Note 3 below).

2. This interrupt is used as Serial Port (UART) Tx interrupt if and only if SSTAT.5 = 1, and is disabled otherwise. Although the 

P89LPC907 does not have the RxD pin, this function is still available to allow switching the Tx interrupt vector.

3. If SSTAT.0 = 1, the following Serial Port additional flag bits can cause this interrupt: FE, BR, OE