P89LPC901 PHILIPS [NXP Semiconductors], P89LPC901 Datasheet - Page 30

• Manufacturer Part Number: P89LPC901
• Description: 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 11:
9397 750 12293
Product data
Clock source
On-chip oscillator or Watchdog oscillator
External clock input
Low/medium/high speed oscillator
(external crystal or resonator)
Fig 17. Interrupt sources, interrupt enables, and power-down wake-up sources (P89LPC903).
(RTCCON.1)
Number of I/O pins available
WDOVF
RTCF
ERTC
8.12.1 Port configurations
8.12 I/O ports
The P89LPC901 has between 3 and 6 I/O pins: P0.4, P0.5, P1.2, P1.5, P3.0, and
P3.1 The exact number of I/O pins available depends on the clock and reset options
chosen, as shown in
The P89LPC902 and P89LPC903 devices have either 5 or 6 I/O pins depending on
the reset pin option chosen.
All but one I/O port pin on the P89LPC901/902/903 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.
EA (IE0.7)
TI & RI/RI
ES/ESR
EWDRT
BOPD
EKBI
KBIF
EBO
CMF
EST
ET1
ET0
TF1
TF0
Reset option
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
EC
TI
Rev. 04 — 21 November 2003
Table
11.
8-bit microcontrollers with two-clock 80C51 core
P89LPC901/902/903
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
002aaa452
WAKE-UP
(IF IN POWER-DOWN)
Number of I/O pins
(8-pin package)
6
5
5
4
4
3
INTERRUPT
TO CPU
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