P89LPC901FD datasheet(30/55 Pages) PHILIPS

30 / 55 page

Philips Semiconductors

P89LPC901/902/903

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 04 — 21 November 2003

30 of 55

9397 750 12293

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 Table 11.

The P89LPC902 and P89LPC903 devices have either 5 or 6 I/O pins depending on

the reset pin option chosen.

8.12.1

Port conﬁgurations

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.

Fig 17. Interrupt sources, interrupt enables, and power-down wake-up sources (P89LPC903).

002aaa452

BOPD

EBO

KBIF

EKBI

INTERRUPT

TO CPU

WAKE-UP

(IF IN POWER-DOWN)

EWDRT

CMF

EA (IE0.7)

RTCF

ERTC

(RTCCON.1)

WDOVF

TF1

ET1

TI & RI/RI

ES/ESR

EST

TF0

ET0

Table 11:

Number of I/O pins available

Clock source

Reset option

Number of I/O pins

(8-pin package)

On-chip oscillator or Watchdog oscillator

No external reset (except during power-up)

External RST pin supported

External clock input

No external reset (except during power-up)

External RST pin supported

Low/medium/high speed oscillator

(external crystal or resonator)

No external reset (except during power-up)

External RST pin supported

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