3/26/2023 0 Comments Fuse studio![]() ![]() In the case of the ATmega328P, one of three different voltages (nominally 1.8V, 2.7V, or 4.3V) may be selected as the minimum allowable supply voltage. As you can see, the entire Extended Fuse Byte deals with the Brownout detection level. Brownout detection is a feature of many microcontrollers that allows them to reset when the supply voltage falls below a certain level. Table 31-5 from the November 2016 version of the ATmega328/P datasheet is reproduced below. Three of the fuse bits are contained in the "Extended Fuse Byte", eight are contained in the "Fuse High Byte," and eight more are contained in the "Fuse Low Byte". There are a total of 19 fuse bits that are used in the ATmega328P, and they are separated into three different fuse bytes. You will need the ATmega328P programming circuit as shown below in order to continue with this project. A schematic diagram, a complete parts list, and construction details are contained in a previous article. ATmega328P Programming CircuitĪ simple programming circuit for the ATmega328P is shown in the photograph below. The fuse bits for selecting the clock source will be dealt with in more depth, including the how and why of a 16 MHz external crystal oscillator. This article will explain what these operations are in the ATmega328P, and how to set them in general. Article Overviewįuse bits, also known as fuses or configuration bits, are settings made in microcontrollers to control certain operations that are not normally changed during the execution of the program code. This project introduces ATmega328P fuse bits and shows how to set them to use an external 16 MHz crystal oscillator. ![]()
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