P89LPC938FDH datasheet(9/68 Pages) PHILIPS

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9397 750 14051

Product data sheet

Rev. 01 — 25 February 2005

9 of 68

Philips Semiconductors

P89LPC938

8-bit microcontroller with 10-bit A/D converter

P1.3/INT0/SDA

I/O

P1.3 — Port 1 bit 3 (open-drain when used as output).

INT0 — External interrupt 0 input.

I/O

SDA — I2C serial data input/output.

P1.4/INT1

P1.4 — Port 1 bit 4.

INT1 — External interrupt 1 input.

P1.5/RST

P1.5 — Port 1 bit 5 (input only).

RST — External Reset input during power-on or if selected via UCFG1.

When functioning as a reset input, a LOW on this pin resets the

microcontroller, causing I/O ports and peripherals to take on their default

states, and the processor begins execution at address 0. Also used

during a power-on sequence to force In-System Programming mode.

When using an oscillator frequency above 12 MHz, the reset input

function of P1.5 must be enabled. An external circuit is required to

hold the device in reset at power-up until VDD has reached its

speciﬁed level. When system power is removed VDD will fall below

the minimum speciﬁed operating voltage. When using an oscillator

frequency above 12 MHz, in some applications, an external

brownout detect circuit may be required to hold the device in reset

when VDD falls below the minimum speciﬁed operating range.

P1.6/OCB

I/O

P1.6 — Port 1 bit 6.

OCB — Output Compare B.

P1.7/OCC/

AD04

I/O

P1.7 — Port 1 bit 7.

OCC — Output Compare C.

AD04 — ADC0 channel 4 analog input.

P2.0 to P2.7

I/O

Port 2: Port 2 is an 8-bit I/O port with a user-conﬁgurable output type.

During reset Port 2 latches are conﬁgured in the input only mode with the

internal pull-up disabled. The operation of Port 2 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 “DC electrical characteristics” for details.

All pins have Schmitt triggered inputs.

Port 2 also provides various special functions as described below:

P2.0/ICB/AD07

I/O

P2.0 — Port 2 bit 0.

ICB — Input Capture B.

AD07 — ADC0 channel 7 analog input.

P2.1/OCD/

AD06

I/O

P2.1 — Port 2 bit 1.

OCD — Output Compare D.

AD06 — ADC0 channel 6 analog input.

P2.2/MOSI

I/O

P2.2 — Port 2 bit 2.

I/O

MOSI — SPI master out slave in. When conﬁgured as master, this pin is

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

P2.3/MISO

I/O

P2.3 — Port 2 bit 3.

I/O

MISO — When conﬁgured as master, this pin is input, when conﬁgured

as slave, this pin is output.

Table 3:

Pin description …continued

Symbol

Type Description

TSSOP28,

PLCC28

HVQFN28

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