Target MCU offline downloader

A target MCU offline downloader comprises a single-chip microcomputer used for controlling program data downloading, an upper computer communication circuit, a memory, an LCD display screen, a keyboard, a to-be-downloaded program data transmission circuit and a power supply module. The upper computer communication circuit adopts a USB interface circuit and is used for inputting a power supply or transmitting data with an upper computer, an upper computer communication interface of the single-chip microcomputer is connected with a downloading single-chip microcomputer connection interface of the upper computer communication circuit, and an upper computer connection interface of the upper computer communication circuit is used for being connected with a downloading transmission interface of the upper computer; a memory data input/output end of the single chip microcomputer is connected with a data input/output end of the memory; the display signal output end of the single-chip microcomputer is connected with th