8/12/2019 SP12 AVR Programmer.doc
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AVR Programmer
The final item on the list is a programmer, to upload the code
to the uC. You will need this nomatter what language you use. A
convenient, fully documented programmer wasn't availa le, so
wewrote one ourselves. !ere you have the diagram for a little oard
containing "ust a a #ip$soc%et forthe uC, a crystal and very few
other parts, as used y our programmer&
ote that the parallel ports of modern PC's usually provide a
rather modest voltage, around (.)V.*uite enough for low voltage AVR
uC's, ut some devices really do re+uire more, an e ample eing
theAT-ega / .
0ut the software is "ust as suita le for 1in circuit'
programming. 2n that case, the target oardmust allow free access to
-342, -243, 4C5 and Reset. 4C5 should e terminated on the target
oardusing a 66pf capacitor and a 77 ohms resistor, unless your ca
le includes the 1dongle' mentioned
elow. Power$on reset can e improved using a 75 resistor and a 77
8 77 nano$farad9 capacitor.
The latter com ination allows sp 6 sufficient access to
Reset&
