ELECTRONIC DEVICE, UNIT USING THE SAME, AND SYSTEM.

摘要

A MAIN UNIT (100) INCLUDES A FILE MANAGER (10) FOR INPUTTING AND OUTPUTTING DATA FILES AND AN ADD-ON DRIVER (3) FOR PERFORMING AN EXTENDED FUNCTION. THE FILE MANAGER (10) AND THE ADD-ON DRIVER (3) ARE CONNECTED TO A FIRST SERIAL INTERFACE (12) THROUGH RESPECTIVE PROTOCOL CIRCUITS. INPUT TERMINALS OF THE FIRST SERIAL INTERFACE (12) ARE CONNECTED TO PREDETERMINED CONTACTS OF A CONNECTING SECTION (101-110), RESPECTIVELY. A POWER SUPPLY (15) SUPPLIES POWER VCC AND VSS TO PREDETERMINED CONTACTS IN THE CONNECTING SECTION (101-110). DATA IS EXCHANGED WITH A REGISTER (21) AND A PAGE BUFFER (22) THROUGH A SECOND SERIAL INTERFACE (20) PROVIDED IN AN ELECTRONIC DEVICE (200). A READ AREA AT AN ARBITRARY ADDRESS IN THE REGISTER (21) IS USED AS AN AREA IN WHICH A CURRENT VALUE IS WRITTEN. A WRITE AREA AT THE SAME ADDRESS IS USED AS AN AREA IN WHICH A CONTROL SIGNAL IS WRITTEN. FOR EXAMPLE, A CURRENT SUPPLIABILITY BIT AND A FUNCTION ENABLED BIT ARE PROVIDED. (FIGURE 1)