P89LPC930FDH datasheet(9/55 Pages) PHILIPS

9 / 55 page

Philips Semiconductors

P89LPC930/931

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 05 — 15 December 2004

9 of 55

9397 750 14472

[1]

Input/Output for P1.0-P1.4, P1.6, P1.7. Input for P1.5.

P3.0 - P3.1

9, 8

I/O

Port 3: Port 3 is an 2-bit I/O port with a user-conﬁgurable output type. During reset

Port 3 latches are conﬁgured in the input only mode with the internal pull-up disabled.

The operation of Port 3 pins as inputs and outputs depends upon the port

conﬁguration selected. Each port pin is conﬁgured independently. Refer to Section

8.11.1 “Port conﬁgurations” and Table 7 “DC electrical characteristics” for details.

All pins have Schmitt triggered inputs.

Port 3 also provides various special functions as described below:

I/O

P3.0 — Port 3 bit 0.

XTAL2 — Output from the oscillator ampliﬁer (when a crystal oscillator option is

selected via the FLASH conﬁguration).

CLKOUT — CPU clock divided by 2 when enabled via SFR bit (ENCLK - TRIM.6). It

can be used if the CPU clock is the internal RC oscillator, Watchdog oscillator or

external clock input, except when XTAL1/XTAL2 are used to generate clock source

for the real time clock/system timer.

I/O

P3.1 — Port 3 bit 1.

XTAL1 — Input to the oscillator circuit and internal clock generator circuits (when

selected via the FLASH conﬁguration). It can be a port pin if internal RC oscillator or

Watchdog oscillator is used as the CPU clock source, and if XTAL1/XTAL2 are not

used to generate the clock for the real time clock/system timer.

VSS

Ground: 0 V reference.

VDD

Power Supply: This is the power supply voltage for normal operation as well as Idle

and Power Down modes.

Table 3:

Pin description…continued

Symbol

Type

Description

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