- on Microcontrollers
- Published in issue 7/2010 on page 92
(Summer Circuits 2010 article)
Even though you can’t actually damage the microcontroller in the ATM18 project by the configuration of its fuse bits, setting them wrongly can however disable it. There are actually several different ways of cutting off the branch you’re sitting comfortably on. Thus it is possible to accidentally change, for example, the programmer access mode or the clock source. In both the aforementioned cases, bringing your microcontroller back to life can take some time and may even need equipment you don’t have to hand.
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1,R2 = 10kOhm
C1,C2 = 22pF (2.5mm)
C3,C4 = 100nF (2.5mm)
IC1 = ATmega88-20PU, programmed
Q1 = 16MHz quartz crystal, HC-49 case, low-profile
K5 = 6-pin SIL pinheader
K9 = 7-pin SIL pinheader
K10 = 9-pin SIL pinheader
K11 = 5-pin SIL pinheader
K12 = 8-pin SIL socket strip
28-way DIP socket, length = 7.62mm
PCB # 090896-1