BUY C8051F501 https://www.utsource.net/itm/p/4315997.html

Description: 8-bit Microcontroller with Flash Memory Features: 8051 Core Up to 20 MHz Clock Speed Up to 8 kB Flash Memory Up to 256 Bytes of RAM Up to 32 I/O Lines Up to 16 External Interrupts Up to 8 Timers/Counters Up to 4 Serial Channels On-Chip Oscillator On-Chip Reset Circuit On-Chip Power-On Reset On-Chip Brown-Out Reset On-Chip Watchdog Timer On-Chip Voltage Regulator On-Chip Temperature Sensor On-Chip Power Management On-Chip Debugging On-Chip Code Protection On-Chip Flash Memory On-Chip Boot Loader On-Chip Security Features Applications: Automotive Industrial Control Consumer Electronics Medical Devices Security Systems Telecom/Networking Embedded Systems (For reference only)