CH540 Overview
CH543 Datasheet http://wch.cn USB PD MCU CH543/CH542, USB MCU CH541/CH540 Datasheet Version: Overview CH543 is a USB and USB PD enhanced E8051 core MCU patible with MCS51 instruction set. 79% of its instructions are single-byte single-cycle instructions, and the average instruction speed is 8 to 15 times faster than that of the standard MCS51.