If you have all ready have your USBasp programmer, which is previously posted on my blog as USB AVR PROGRAMMER then there is no need build new hardware you just need to change the firmware of the programmer microcontroller. SCK option to support targets with low clock speed (Programming speed is up to 5kBytes/sec.No special controllers or smd components are needed.The programmer uses a firmware-only USB driver, no special USB controller is needed.
It simply consists of an ATMega8 and a couple of passive components. This simple microcontroller programmer can progam most of the 89 like Atmel's AT89S51, AT89S52, AT89S53, AT89S8252, AT89S8253 including the Atmel AVR series of microcontroller, it does not support 89C series.
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