Device and method capable of changing codes of micro-controller

A device capable of changing codes of a micro-controller comprising:

• a micro-controller;
• an address latch comprising two input terminals respectively connected to a multiplex bus and an address latch enable (ALE) pin of said micro-controller;
• a flash memory whose input terminals are connected to said address latch and an address bus of said micro-controller and whose output terminals are connected to the input terminal of said address latch, the flash memory having a renovation program and an general program both recorded therein;
• a static random access memory (SRAM) whose input terminals are connected to said address latch and an address bus of said micro-controller and whose output terminal are connected to the input terminal of said address latch;
• and
• a logic circuit whose input terminals are respectively connected to an output port pin, a read (RD) pin, a write (WR) pin, and a program store enable (PSEN) pin of said micro-controller and whose output terminals are respectively connected to a write enable (WE) pin and an output enable (OE) pin of said flash memory and a write enable (WE) pin and an output enable (OE) pin of said static random access memory, therein, voltages of the pins of the flash memory being WE=1 and OE=PSEN and voltages of the pins of the SRAM being WE=WR, and OE=RD as a voltage of the output port pin is high, the voltages of the pins of the flash memory being WE=WR and OE=RD and the voltages of the pins of the SRAM being WE=1 and OE=PSEN as the voltage of the output port pin is low;
• wherein, during a period of changing code, the renovation program of the flash memory controls the micro-controller to copy the renovation program itself into the SRAM and then, by changing the voltage of the output port pin to low, makes the renovation program recorded in the SRAM control the micro-controller for replacing the general program of the flash memory with a new program.