SPI-Flash Programmer 3.7

Posted on Feb 6, 2014

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 serie

SPI-Flash Programmer 3.7
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s devices. Figure 1 shows the circuit diagram of the SPI Flash programmer hardware interface, the power to the interface is provided either by a 9V dc adapter or a 9V battery. The 74HCT367 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. The 74HCT04 is used to generate the clock signal for the u-controller when programming the device in stand-alone mode. Figure 2 shows the connection diagram for the stand-alone programming, the u-controller to be program is placed on a breadboard or on a veroboard with a ZIF socket, the required signals are then wired to the respective pins of the u-controller. 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.

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