LPC920F View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
LPC920F Datasheet PDF : 45 Pages
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Philips Semiconductors
P89LPC920/921/922
8-bit microcontrollers with two-clock 80C51 core
RTCF
ERTC
(RTCCON.1)
WDOVF
IE0
EX0
IE1
EX1
BOPD
EBO
KBIF
EKBI
EWDRT
CMF2
CMF1
EC
EA (IE0.7)
TF0
ET0
TF1
ET1
TI & RI/RI
ES/ESR
TI
EST
SI
EI2C
Fig 6. Interrupt sources, interrupt enables, and power-down wake-up sources.
WAKE-UP
(IF IN POWER-DOWN)
INTERRUPT
TO CPU
002aaa418
8.12 I/O ports
The P89LPC920/921/922 has three I/O ports: Port 0, Port 1, and Port 3. Ports 0 and
1 are 8-bit ports, and Port 3 is a 2-bit port. The exact number of I/O pins available
depend upon the clock and reset options chosen, as shown in Table 6.
Table 6: Number of I/O pins available
Clock source
Reset option
On-chip oscillator or watchdog oscillator
External clock input
Low/medium/high speed oscillator
(external crystal or resonator)
No external reset (except during power-up)
External RST pin supported
No external reset (except during power-up)
External RST pin supported
No external reset (except during power-up)
External RST pin supported
Number of I/O pins
(20-pin package)
18
17
17
16
16
15
8.12.1 Port configurations
All but three I/O port pins on the P89LPC920/921/922 may be configured by software
to one of four types on a bit-by-bit basis. These are: quasi-bidirectional (standard
80C51 port outputs), push-pull, open drain, and input-only. Two configuration
registers for each port select the output type for each port pin.
P1.5 (RST) can only be an input and cannot be configured.
P1.2 (SCL/T0) and P1.3 (SDA/INT0) may only be configured to be either input-only or
open-drain.
9397 750 12285
Product data
Rev. 06 — 21 November 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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