In parallel port mode, CH341 provides an 8-bit parallel interface in EPP mode or MEM mode for input and output data directly without a microcontroller/DSP/MCU. In LPT mode, CH341 provides a standard USB print port compatible with USB-related specifications and the Windows operating system for upgrading a print port printer directly to the USB. In UART mode, CH341 provides UART transmit enable, UART receive ready rate control signals and so on, and common MODEM interface signals, to expand UART interface of computer or upgrade common serial communication devices to USB directly. CH341 is a USB converter chip, which converts USB to serial UART interface, printer interface, parallel port interface, and common 2/4 synchronize serial communication interfaces etc.
