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Programming
adaptor for 8 and 28 pin AVR
Microcontrollers using ISP
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.
This
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.
When
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
being programmed.
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 .
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