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SPI Flash Microcontroller Programmer    Ver 3.7


    This SPI Flash Programmer can be used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable devices. The programmer hardware interface is controlled by the PC parallel port and the parallel port control signals are freely selectable by the user. The software supports both the 8051 and AVR series devices.



    Figure 1 shows  the  circuit diagram of the SPI Flash programmer hardware interface,  the  power to  the  interface  is provided either by programmed device. The 74HCT541 IC buffer the parallel port signals. It is necessary to use the HCT type IC in order to make sure the programmer should also work with the 3V type parallel port. 

Shematic is given below sch_avr









and here is high quality shematics in PDF format to download


PCB layout with component placement pcb_avr









and here is high quality version in PDF format to download


PCB tracks wor PCB development pcb1 avr


and here is high quality version in PDF format to download




    The  file contains the main program and the io port driver. Place all files  in the same folder.

     The main view of the program is shown in figure 3.

     Also   make   sure   do   not   program    the    RSTDISBL    fuse   in   the AVR series devices, unless it is necessary  otherwise  further  serial  programming  is  disable, to  restore the serial programming a  high voltage parallel  programmer is required.


    For  the  fuses setting consult the datasheet of  the respective u-controller


    Following are the main features of this software,

      # Read and write the BIN, HEX and ROM file formats
      # Read Signature, Fuse and Lock bits
      # Edit, Clear and Fill the Flash & Eeprom memory buffer
      # Verify with memory buffer
      # Auto save the OSCCAL data to Flash & Eeprom
      # Display buffer checksum
      # Program selected Fuse & Lock bits
      # Auto save the fuses settings for the open program file
      # Parallel port pins are freely selectable
      # EEPROM file open and save commands

    Download   SPI-Flash Programmer Software















Main view of the program SPI-Pgm  Ver 3.7


This programator is reliable and extreamly cheap to build. Only downside is that most laptops and newer computers do not have parallel port anymore.. Also if you have x64 bit windows try first to start program to see if it is possible.. If you have desktop PC with parallel port and want simple for little cash than this is right choice.

and here is bonus ALTIUM project for this AVR DIY programmator to download