![]() Assuming I'm trying to use SPI with no slave device attached (thus no way to lose external power), would the microcontroller still use more power? However, do certain operations within the microcontroller cause it to consume more power? I'm specifically interested in the case of implementing serial communications like SPI. supplying 10mA to an LED would increase the total amount of current going into the micro controller). I assume that the listed power output also excludes any additional power that the chip is sourcing to I/O (i.e. What is the relationship between voltage and the power consumption? I understand that DC power is defined by W = VI, however, if I were to operate at 3.3V, wouldn't I pull less current? I'm not sure if that is a correct assumption however. does operating at 8Mhz consume 0.2mA * 8 = 1.6 mA of current? I have several questions regarding this number:īecause these microcontrollers can operate at 8Mhz and 16Mhz, is the power consumption a linear function of frequency? i.e. Referring to the data sheet containing information on the Atmega328p ( ), it states that the power consumption of a 1Mhz, 1.8V, 25C operating mode consumes 0.2 mAs of current. I've realized I'm pretty clueless on how microcontrollers are rated on power consumption. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running.I'm currently working with a barebone Atemga328p microcontroller implemented within a battery powered design. If the RSTDISBL fuse is not used, PC6 is used as a reset input. If the RSTDISBL fuse is programmed, PC6 is used as an input pin. The port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activate. Symmetrical drive characteristics with both high sink and source capability. Port C is a 7-bit bi-directional I/O port with internal pull-up resistors ( for each bit). If the internal calibrate RC oscillator is use as chip clock source, PB7.6 is use as TOSC2.1 input for the asynchronous Timer/Counter2 if the AS2 bit in ASSR is set. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running.ĭepending on the clock selection fuse settings, PB6 can be use as input to the inverting oscillator amplifier and input to the internal clock operating circuit.ĭepending on the clock selection fuse settings, PB7 can be use to output from the inverting oscillator amplifier. The Port B output buffers have symmetrical drive characteristics with both high sink and source capability.Īs inputs, port B pins that are externally pull low will source current if the pull-up resistors are activated. Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
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