P89LPC907FD datasheet(30/51 Pages) PHILIPS

30 / 51 page

Philips Semiconductors

P89LPC906/907/908

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 05 — 17 December 2004

30 of 51

9397 750 14467

8.11 I/O ports

The P89LPC906 has between 3 and 6 I/O pins: P0.4, P0.5, P0.6, 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.

[1]

Required for operation above 12 MHz.

The P89LPC907 and P89LPC908 devices have either 5 or 6 I/O pins depending on

the reset pin option chosen.

8.11.1

Port conﬁgurations

All but one I/O port pin on the P89LPC906/907/908 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 14. Interrupt sources, interrupt enables, and power-down wake-up sources (P89LPC908).

002aaa467

BOF

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[1]

Low/medium/high speed oscillator

(external crystal or resonator)

No external reset (except during power-up)

External RST pin supported[1]

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