P87LPC768 [NXP]

Low Power, Low System Cost 80C51 MCU with ADC and PWM; 低功耗，低系统成本80C51单片机ADC和PWM


型号：	P87LPC768
厂家：	NXP
描述：	Low Power, Low System Cost 80C51 MCU with ADC and PWM 低功耗，低系统成本80C51单片机ADC和PWM
文件：	总2页 (文件大小：97K)
中文：	中文翻译
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Low Power, Low System Cost

80C51 MCU with ADC and PW M

P87LPC768

As a member of the 51LPC microcontroller family, the 87LPC768

offers an 8-bit ADC with four multiplexed channels and an 8-bit

Pulse Width Modulator (PWM.) Further, the device provides 4K

of OTP code memory and 128 bytes of data SRAM, making it

suitable for high-level programming. The code memory is In-System

Programmable (ISP) through a serial interface. Other embedded

features that reduce the need for external components are brownout

detection, power-on reset and an on-chip RC oscillator that is very

stable over temperature and voltage.

The MCU core is fully compatible with the industry-standard C51

core, but features a 2X speed mode, where the CPU clock is divided

by 6 instead of 12. At 20 MHz, the 51LPC family devices provide

a throughput identical to a conventional C51 running at 40 MHz,

thus minimizing EMI and power consumption. The 87LPC768 is

manufactured in Philips Semiconductor’s low-power CMOS tech-

nology and is well suited for use in battery powered applications.

At 32kHz, the device consumes only 16µA and the operating volt-

age ranges from 2.7 – 6.0V (3.0 – 6.0V for analog peripherals). A

fixed-frequency oscillator running at 6 MHz can be used to clock

the device in applications that do not require the high accuracy of

a crystal. Regardless of the clock source used, the user can reduce

operating frequency down to as much 1/512 of the source frequen-

cy, allowing the user to optimize performance and power consump-

tion on-the-fly. Use of the on-chip power-on reset and oscillator

makes up to 18 I/O pins available to the user, leaving only two

non-I/O pins for connection to power and ground.

The P87LPC768 is available in 20-pin SOIC and PDIP packages

Key Features

•

4-channel Pulse Width Modulator (PWM) generator

— Configurable resolution 1 – 10 bits

4-channel, 8-bit Analog-to-Digital Converter

— 9.3 microseconds conversion time at 20 MHz

— 100% accelerated C51 CPU core runs at 6 clocks

per instruction

•

Because the P87LPC768 combines an embedded ADC and PWM,

it is especially useful in applications that include dynamic position-

ing, speed and temperature control. The PWM provides very

high flexibility since the output resolution can be configured to

any number of bits up to 10.

•

20 MHz maximum operating frequency 4.5 – 6.0V and

10 MHz maximum operating frequency 2.7 – 6.0V

Configurable brownout reset detector

On-chip serial communications interfaces

— UART

•

— I C

The device comes with extensive serial communication capabilities.

On-chip UART provides serial communications for RS-232 and

•

Five I/O pin modes, individually selectable for each pin

— Quasi bi-directional

— Push-pull output

— Open drain output

— Input

RS-485. The I C interface provides interface to other I C units

such as serial EEPROMs, other MCUs and a variety of peripheral

devices. These communications interfaced in combination with

the analog capabilities makes the 87LPC768 ideal for a variety of

sensor applications.

— Schmitt trigger input

Up to 18 pins usable for general purpose I/O

O rdering Inform ation

Part Number

Temperature (C)

0 to +70

Package Description

Operating Frequency

All devices operate at

20MHz @ 4.5 to 6.0V

10MHz @ 2.7 to 6.0V

P87LPC768BN

P87LPC768BD

P87LPC768FN

P87LPC768FD

Plastic Dual In-Line [PDIP20]

Plastic Small Outline [SOIC20]

Plastic Dual In-Line [PDIP20]

Plastic Small Outline [SOIC20]

0 to +70

–40 to +85

Low Power, Low System Cost 80C51 MCU with ADC and PW M

P87LPC768

LPC768 Block Diagram

• Two analog comparators.

• Full duplex UART.

ACCELERATED

80C51 CPU

• I C communication port.

• Eight keypad interrupt inputs, plus two additional external

interrupt inputs.

INTERNAL

BUS

4K BYTE

CODE EPROM

UART

• Four interrupt priority levels.

• Watchdog timer with separate on-chip oscillator, requiring

no external components. The watchdog timeout time is

selectable from 8 values.

128 BYTE

DATA RAM

PORT 2

CONFIGURABLE I/Os

TIMER 0, 1

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

with no external reset components.

WATCHDOG TIMER

AND OSCILLATOR

PORT 1

CONFIGURABLE I/Os

• 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.

ANALOG

COMPARATORS

PORT 0

CONFIGURABLE I/Os

A/D

CONVERTER

• Oscillator Fail Detect. The watchdog timer has a separate

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

fail detect function.

KEYPAD

INTERRUPT

PULSE WIDTH

MODULATOR

• 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.

POWER MONITOR

(POWER-ON RESET,

BROWNOUT RESET)

CRYSTAL OR

RESONATOR

CONFIGURABLE

OSCILLATOR

ON-CHIP R/C

OSCILLATOR

• Programmable port output configuration options:

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

• Selectable Schmitt trigger port inputs.

Features

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

• 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

to 20 MHz when V_DD= 4.5 V to 6.0 V, 10 MHz when

V_DD= 2.7 V to 6.0 V.

• 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.

• Four-channel Pulse Width Modulator.

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

Conversion time of 9.3 microseconds at f_osc= 20 MHz.

• Serial EPROM programming allows simple in-circuit

production coding. Two EPROM security bits prevent

reading of sensitive application programs.

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

• 4 K bytes OTP memory.

• 128 byte RAM data memory.

• 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.

• 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.

• 20-pin DIP and SO packages.

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

North America

Europe

Asia

Japan/Korea

Tel: 1 800 234-7381

Internet:

www.PhilipsMCU.com

Fax: +31 79 3685126

Fax: 886 2 2134-2941

Fax: +81-3-3740-5057

Internet (in Japanese):

www.philips.co.jp/semicon/

does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for

any consequence of its use. Publication thereof does not convey nor imply any license under patent - or industrial or intellectual property rights.

Printed in the USA 611651/14K/FP/2pp/0500

9397-750-07045

P87LPC768 [NXP]

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