P89LPC954 datasheet(12/69 Pages) NXP

12 / 69 page

P89LPC952_954_4

Product data sheet

Rev. 04 — 24 July 2008

12 of 69

NXP Semiconductors

P89LPC952/954

8-bit microcontroller with 10-bit ADC

P2.5/SPICLK

I/O

P2.5 — Port 2 bit 5.

I/O

SPICLK — SPI clock. When conﬁgured as master, this pin is

output; when conﬁgured as slave, this pin is input.

P2.6

I/O

P2.6 — Port 2 bit 6.

P2.7

I/O

P2.7 — Port 2 bit 7.

P3.0 to P3.1

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 11 “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.

P4.0 to P4.7

I/O

Port 4: Port 4 is an 8-bit I/O port with a user-conﬁgurable

output type. During reset Port 4 latches are conﬁgured in the

input only mode with the internal pull-up disabled. The

operation of Port 4 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 11 “Static characteristics” for details.

All pins have Schmitt triggered inputs.

Port 4 also provides various special functions as described

below:

P4.0

I/O

P4.0 — Port 4 bit 0.

P4.1/TRIG

I/O

P4.1 — Port 4 bit 1.

TRIG — Debugger trigger output.

P4.2/TXD1

I/O

P4.2 — Port 4 bit 2.

TXD1 — Transmitter output for serial port 1.

P4.3/RXD1

I/O

P4.3 — Port 4 bit 3.

RXD1 — Receiver input for serial port 1.

Table 3.

Pin description …continued

Symbol

Type Description

LQFP48

PLCC44

LQFP44

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