Dick Cappels' project pages
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adaptor for 8 and 28 pin AVR
Microcontrollers using ISP
adaptor lets me
program 8 or 20 pin DIP devices using the In-System
Programmer (ISP) described in Atmel's AVR910 application note.
This circuit provides power and clocks for the part to be programmed
and power to the ISP circuit.
Ok...its not pretty, but its practical. The 20 pin connector at the far
right is left over from a diffferent project and is no longer used.
programming 8 pin
devices, the part is positioned toward pins 1 and 20 of the socket
such that the 8 pins of the chip occupy the pins 1,2,3,4,17,18,19,
abd 20 of the programming socket.In the case of an 8 pin part being
programmed, the SPST switch that grounds pin 4 must to be
closed.Conversely, when programming a 20 pint part, the switch on pin
4 must be open so the crystal can be used for the clock for the part
I picked up the
sometimes hard-to-find 20 pin ZIF socket from Iguan
Labs (www.iguanalabs.com ).
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Richard Cappels All Rights Reserved .