P89LPC9381 datasheet(9/60 Pages) PHILIPS

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P89LPC9381_1

Product data sheet

Rev. 01 — 8 September 2006

9 of 60

Philips Semiconductors

P89LPC9381

8-bit microcontroller with 10-bit ADC

[1]

Input/output for P1[0] to P1[4], P1[6], P1[7]. Input for P1[5].

P3[1:0]

I/O

Port 3: Port 3 is a 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 7.13.1 “Port conﬁgurations” and Table 10 “Static characteristics” for

details.

All pins have Schmitt triggered inputs.

Port 3 also provides various special functions as described below:

P3[0]/XTAL2/

CLKOUT

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 RTC/system timer.

P3[1]/XTAL1

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 RTC/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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