Fangrui Product Details Features: [ch32v003f4p6-evt-r0]qingke 32-bit Risc-v2a Processor With 2-level Interrupt Nesting Support; Up To 48mhz System Main Frequency; 2kb Sram, 16kb Flash; Power Supply Voltage: 3.3/5v Multiple Low-power Modes: Sleep, Standby Power Up/down Reset, Programmable Voltage Detector 1 Group Of 1-channel General-purpose Dma Controller; 1 Group Of Opa; 1 Group 10-bit Adc; 1 16-bit Advanced-control Timer And 1 16-bit General-purpose Timer; 2 Watchdog Timers And 1 32-bit Systick Timer; 1 Usart Interface, 1 Group Of Ic Interface, 1 Group Of Spi Interface; 18 I/o Ports, Mapping An External Interrupt; 64-bit Chip Unique Id; 1-wire Serial Debug Interface(sdi) Ch32v003 Series Is Based On The Qingke Risc-v2a Core Design Of Industrial-grade General-purpose Microcontroller, Support 48mhz System Main Frequency, With Wide Voltage, 1-wire Sdi, Low-power Consumption, Ultra-small Package, Etc. Ch32v003 Series Built-in A Group Of Dma Controller, A Group Of 10-bit Adc, A Group Of Opa, Multiple Timers And Standard Communicati