P89LPC904FD datasheet(21/41 Pages) PHILIPS

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Philips Semiconductors

P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core

Preliminary data

Rev. 02 — 25 June 2004

21 of 41

9397 750 13521

8.13 I/O ports

The P89LPC904 has either 5 or 6 I/O pins depending on the reset pin option chosen.

Refer to Table 6.

8.13.1

Port conﬁgurations

All but one I/O port pin on the P89LPC904 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 6.

Interrupt sources, interrupt enables, and power-down wake-up sources (P89LPC904).

002aaa784

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

ENADCI1

ADCI1

ENBI1

ENBI0

EAD

Table 6:

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

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