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 technology and is well suited for use in battery powered applications.
At 32kHz, the device consumes only 16µA and the operating voltage 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 frequency, allowing the user to optimize performance and power consumption 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.
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.
The device comes with extensive serial communication capabilities.
On-chip UART provides serial communications for RS-232 and RS-485. The I2C interface provides interface to other I2C 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.

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
• 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
   — I2C
• Five I/O pin modes, individually selectable for each pin
   — Quasi bi-directional
   — Push-pull output
   — Open drain output
   — Input
— Schmitt trigger input
• Up to 18 pins usable for general purpose I/O