with the AVR Dragon and AVaRICE you can debug the ATmega328P using the debugWIRE interface. Usually everything between 3.3 V and 5 V should work.Į.g. Please note that the supply voltage should be compatible with the logic level of the TTL adapter. To use the programmer instead, run make BOARD=atmega328p PROGRAMMER= flashĬonnect a TTL adapter with pins 2/RXD and 3/TXD an run make BOARD=atmega328p term When using the usbtiny (or one of the super cheap clones) running make BOARD=atmega328p flash Connect the programmer as follows: ISCP pin In order to flash the ATmega328P without a bootloader, an ICSP programmer is needed. For more details, refer to the official datasheet. At 1 MHz core clock a supply voltage of 1.8V is possible resulting in an active supply current of less than 0.3 mA (about 0.5 mW power consumption). The lowest possible supply voltage at 8 MHz is 2.7V (with some safety margin), which results in an active supply current of less than 3 mA (about 8 mW power consumption) according to the datasheet. However, higher clock frequencies require higher supply voltages for reliable operation. ![]() Thus, lower power consumption can be achieved by using a lower supply voltage. Relation Between Supply Voltage, Clock Frequency and Power ConsumptionĪ higher supply voltage results in a higher current drawn. Refer to the datasheet on how to configure the ATmega328p to use an external crystal, an external clock source or the clock divider. 1000000 for 1MHz), this core clock can be changed easily. This "board" is configured to use 8MHz as core clock, so that the ATmega328p runs at the highest frequency possible without external clock sources.īy setting the environment variable ATMEGA328P_CLOCK to a custom frequency in Hz (e.g. It will not be needed anymore after the clock device has been disabled.) The -B 32 might be needed on some ISP programmers to communicate with slow ATmega MCUs. (Replace usbtiny with the ISP programmer you are using. This can be done like this: avrdude -c usbtiny -p m328p -B 32 -U lfuse:w:0xe2:m By clearing the CKDIV8 fuse the clock divider can be disabled to operate the ATmega328p at 8MHz without an external clock source. By default the fuses are configured to use the internal 8MHz oscillator and a clock divider resulting in a clock speed of 1MHz. ![]() The ATmega328p has two internal oscillators clocked at 8MHz and at 128kHz that allow it to be operated without any external clock source or crystal. All credit for above pinout image goes to
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