P87LPC769 datasheet(4/61 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

87LPC769

Low power, low price, low pin count (20 pin)

microcontroller with 4 kB OTP 8-bit A/D, and DAC

2001 Jan 11

GENERAL DESCRIPTION

The 87LPC769 is a 20-pin single-chip microcontroller designed for

low pin count applications demanding high-integration, low cost

solutions over a wide range of performance requirements. A

member of the Philips low pin count family, the 87LPC769 offers

programmable oscillator configurations for high and low speed

crystals or RC operation, wide operating voltage range,

programmable port output configurations, selectable Schmitt trigger

inputs, LED drive outputs, and a built-in watchdog timer. The

87LPC769 is based on an accelerated 80C51 processor

architecture that executes instructions at twice the rate of standard

80C51 devices.

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 to 20 MHz when

VDD = 4.5 V to 5.5 V

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

9.3

µS at fosc = 20 MHz.

• Two Digital to Analog Converter (DAC) outputs. (One D/A output

shared with the A/D).

• 4 Kbytes EPROM code 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.

• Two analog comparators.

• Full duplex UART.

• I2C communication port.

• 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 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

87LPC769 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

µA.

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