The main crystal on board is 8M, the highest bus frequency of MCU is 144MHZ. 32.768K crystal on board is low speed crystal.
About SPI and QSPI chips
Onboard EEPROM 24C32 (24C64 for new version) is used for small data or parameter storage.
On-board SP Flash W25Q32 (new version is W25Q64) is used for large capacity data storage.
About the onboard network port
The on-board Ethernet port allows direct wired Ethernet communication with an integrated PHY.
Compared with external PHY hardware or external integrated network chip, it has the advantage of circuit integration.
USB port to download encrypted program (burn file operation)
The two Type-C USB ports on the board can be connected to a USB cable to download encrypted programs. Download the software name WCHISPTool can be obtained from the official website or open in the programming software MounRiver.