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In general this is not a "you must" requirement but a reminder of the fact that the processor can only update one register at a time. On the ATmega series, the input vs. output and the output value or pull-up are controlled by distinct registers with a bit per pin, and the processor can only modify one register at a time, so for any change which ...


As noted in other answer, __memx might help. Check it's description: This is a 24-bit address space that linearizes flash and RAM: If the high bit of the address is set, data is read from RAM using the lower two bytes as RAM address. If the high bit of the address is clear, data is read from flash with RAMPZ set according to the high byte of the address. ...


If your AVR GCC is recent enough you could use __memx address space, see Named Address Spaces in the GCC docu.


Given that the receive pin is driven by something else, the voltage would be whatever the driving circuit drives it to. GSM modules usually run at 3v3 (actually they often run lower) so there is no reason for one to drive to 5 volts. The ATmega's transmit pin, on the other hand, would drive to its supply voltage (except to the degree to which it droops under ...


Imagine a reference frame (inertial frame, spatial frame etc.). The orientation of the IMU is specified with respect to this reference frame. Let's explain part of the the algorithm with an example. Let the reference frame be define so. Z axis points towards centre of earth; i.e. in the direction of gravitational force. Let the X axis point towards north. Y ...


Have a look at LTDC VGA timing specs. At LCD TFT monitors, timing is very similar to standard VGA monitors, but signal orders are different.

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