Bus type bar code decoding chip

The invention provides a bus type bar code decoding chip. The decoding chip comprises a data memory, a register block, a bar code decoding assembly line, a master control logic module and a bus interface, wherein the data memory is used for memorizing a bar code image; the register block comprises a command register and a data register; the command register is used for temporarily storing a command; the data register is used for temporarily storing the data; the bar code decoding assembly line is used for processing the bar code image; the master control logic module acquires a processing command from the command register and transmits the bar code image stored in the data memory to the bar code decoding assembly line for decoding according to the processing command; and the bus interface receives the command from an external bus and transmits the command to the command register. Through the arrangement, the bar code decoding chip can be connected with the bus of a normal microprocessor, so that the burden of