Микроконтроллеры AVR

Power supplies decoupling (выдержка из одного datasheet) In "high frequency" applications, each power plane VCCP, VCCM and VDD should be decoupled with at least 10 capacitor of 0.1 μF... If board space allows an additional ten 0.01 μF ceramic capacitor is recommended for each VDD and VCCM planes... For "medium frequency", each power plane VCCP, VCCM and VDD should be decoupled with at least 10 capacitors of 47 μF... Last step before the power regulator itself is the bulk decoupling. The bulk decoupling can be achieved with five 100 μF, 220 μF or even 330 μF capacitors... Other devices like the DDR memory devices also require local decoupling capacitors. At least eight 0.1 μF capacitors (one for each VDD or VDDQ) combined with one 22 μF or 47 μF are recommended for each memory device. If board space allows an additional eight 0.01 μF ceramic capacitor is recommended. A bulk 330 μF capacitor per device is also recommended.