The CH392F chip comes with 10M Ethernet media transmission layer (MAC) and physical layer (PHY), is fully compatible with IEEE802.3 protocol, and has built-in Ethernet protocol stack firmware such as IP, DHCP, ARP, ICMP, IGMP, UDP, and TCP. The single-chip computer system can easily communicate via the CH392 chip. Supports two communication interfaces: SPI interface or asynchronous serial port, which can be selected by configuring the SEL pin. The built-in pull-up of the SEL pin defaults to the asynchronous serial port mode. If the pull-down resistor R3 is welded, the SPI mode is selected. On-board 5V to 3.3V converter.
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