General description

The P87LPC778 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 P87LPC778 offers a 4 channel, 8-bit A/D converter, 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 P87LPC778 is based on an accelerated 80C51 processor architecture that executes instructions at twice the rate of standard 80C51 devices.

特性 Features

■ An accelerated 80C51 CPU provides instruction cycle times of 300 ns to 600 ns for all instructions except multiply and divide when executing at 20 MHz.

■ 2.7 V to 5.5 V operating range for digital functions.

■ Four channel, 10-bit Pulse Width Modulator.

■ Four channel, 8-bit Analog to Digital Converter. Conversion time is 9.3 μs with a 20 MHz crystal.

■ I2C-bus communication port and Full duplex UART.

■ Internal oscillator 2.5 . The internal oscillator option allows operation with no external oscillator components.

■ Two analog comparators.

■ Eight keypad interrupt inputs, plus two additional external interrupt inputs.

■ Watchdog timer with separate on-chip oscillator, requiring no external components. The Watchdog time-out time is selectable from 8 values.

■ 20-pin TSSOP package.