#USBASP WINDOWS 10 KEYGEN#
This function may be needed to power the programming board from the programmer. JP4 connects to the +5V programming connector from the USB port. This is necessary in order to program the programmer's microcontroller itself. JP3 connects the RESET pin to the programming connector. This is required for programming microcontrollers with low clock speeds (less than 1.5 MHz). With the jumper open, the SCK frequency will be 375 kHz, with the jumper closed - 8 kHz. JP2 changes the frequency of the SCK signal. Many computers will not recognize USBASP if it has 5 volt logic levels. However, without zener diodes, this will not work with all computers. JP1 shorts the string of diodes, which allows you to change the voltage on the programming connector from 3 to 5 V. HL2 indicates that the programmer is in working order. It lights up while the firmware is being written. HL1 signals that the programming process is in progress. I'll tell you about the purpose of the LEDs and jumpers. The circuits connected to the UART were thrown out, since they were not used, and the JP1 jumper was added. Diodes VD1 - VD3 were added to reduce the supply voltage and match the logic levels of the microcontroller and the USB port without zener diodes. I took the scheme from the author's site as a basis and changed it a little. The diagram of the USBasp programmer is shown in the figure below. True, there is one BUT! To revive this programmer, you need to write firmware to the microcontroller, which means that you must already have some kind of working AVR programmer, or at least the opportunity to take it somewhere. It is built on an Atmega8 (or Atmega48) microcontroller, requires a minimum of external components, has several ready-made PCB layouts and shells for programming, and can also work under Linux and MacOS. One of the easiest AVR USB programmers to replicate is the USBasp. All of them can be divided into three groups: programmers based on AVR microcontrollers, in which the USB interface is implemented in software, programmers based on AVR microcontrollers with USB hardware support, and programmers based on FT232 chips that operate in BitBang mode. There are many USB programmer circuits for AVR microcontrollers on the Internet.
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