Low Power, Low System Cost 80C51 MCU with ADC and PWM

P87LPC768

For more information, contact your Philips Semiconductors distributor or www.PhilipsMCU.com

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orth America

Europe

Asia

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Fax: +81-3-3740-5057

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© Philips Electronics N.V. 2000

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Printed in the USA

611651/14K/FP/2pp/0500

9397-750-07045

LPC768 Block Diagram

Features

• An accelerated 80C51 CPU provides instruction cycle

times of 300–600 ns for all instructions except multiply

and divide when executing at 20 MHz. Execution at up

• Four-channel Pulse Width Modulator.

• Four-channel multiplexed 8-bit A/D converter.

• 2.7 V to 6.0 V operating range for digital functions.

• 4 K bytes OTP memory.

• 128 byte RAM data memory.

• 32-byte customer code EPROM allows serialization of

devices, storage of setup parameters, etc.

• Two 16-bit counter/timers. Each timer may be

configured to toggle a port output upon timer overflow.

4K BYTE

CODE EPROM

INTERNAL

BUS

ACCELERATED

80C51 CPU

128 BYTE

DATA RAM

PORT 2

CONFIGURABLE I/Os

PORT 1

CONFIGURABLE I/Os

PORT 0

CONFIGURABLE I/Os

KEYPAD

INTERRUPT

UART

I2C

TIMER 0, 1

WATCHDOG TIMER

AND OSCILLATOR

ANALOG

COMPARATORS

A/D

CONVERTER

PULSE WIDTH

MODULATOR

CONFIGURABLE

OSCILLATOR

ON-CHIP R/C

OSCILLATOR

CRYSTAL OR

RESONATOR

POWER MONITOR

(POWER-ON RESET,

BROWNOUT RESET)

• Two analog comparators.

• Full duplex UART.

• Eight keypad interrupt inputs, plus two additional external

interrupt inputs.

• Four interrupt priority levels.

• Watchdog timer with separate on-chip oscillator, requiring

no external components. The watchdog timeout time is

selectable from 8 values.

• Active low reset. On-chip power-on reset allows operation

with no external reset components.

• Low voltage reset. One of two preset low voltage levels may

be selected to allow a graceful system shutdown when power

fails. May optionally be configured as an interrupt.

• Oscillator Fail Detect. The watchdog timer has a separate

fully on-chip oscillator, allowing it to perform an oscillator

fail detect function.

• Configurable on-chip oscillator with frequency range and

RC oscillator options (selected by user programmed

EPROM bits). The RC oscillator option allows operation

with no external oscillator components.

• Programmable port output configuration options:

quasi-bidirectional, open drain, push-pull, input-only.

• Selectable Schmitt trigger port inputs.

• LED drive capability (20 mA) on all port pins.

• Controlled slew rate port outputs to reduce EMI. Outputs

have approximately 10 ns minimum ramp times.

• 15 I/O pins minimum. Up to 18 I/O pins using on-chip

oscillator and reset options.

• Only power and ground connections are required to operate

the 87LPC768 when fully on-chip oscillator and reset

options are selected.

• Serial EPROM programming allows simple in-circuit

production coding. Two EPROM security bits prevent

reading of sensitive application programs.

• Idle and Power Down reduced power modes. Improved

wakeup from Power Down mode (a low interrupt input

starts execution). Typical Power Down current is

1 microamp.

• 20-pin DIP and SO packages.