51 MCU development board adopts STC89C52RC LQFP-44 main control chip and onboard USB to TTL serial port chip CH340, which is convenient for program download and serial port communication experiment. Maximum clock frequency Hz: 5V 0-80M Flash memory: 8K RAM byte: 512 With EMI reduction With a watchdog With double speed With P4 port With ISP With IAP E2P ROM byte: 2K