BUY P87LPC767FN https://www.utsource.net/itm/p/860638.html
Low power, low price, low pin count 20 pin microcontroller with 4-kbyte OTP and 8-bit A/D converter - ADCs: 4-ch 8-bit ; Clock type: 6-clk 12-clk opt. ; External interrupt: 3 ; Function: 8-bit 80C51 uController ; I/O pins: 18 ; Memory size: 4K kBits; Memory type: OTP ; Number of pins: 20 ; Operating frequency: 0~20@6-clk0~20@12-clk MHz; Operating temperature: 0~85 Cel; Power supply: 2.7~6.0 ; Program security: yes ; PWMs: - ; RAM: 128 bytes; Reset active: Low ; Serial interface: UARTI2C ; Series
Description: 8-bit Microcontroller Features: 8-bit CPU with 8K Bytes of Flash Program Memory Up to 256 Bytes of Data Memory Up to 16 I/O Pins Internal Oscillator On-chip Brown Out Reset Watchdog Timer Power Saving Modes Low Voltage Detection 10-bit A/D Converter SPI Interface I2C Interface UART Interface Timer/Counter Interrupts Applications: Automotive Industrial Consumer Home Appliances Security Systems Medical Devices Robotics (For reference only)