However, writing a logic one to a bit in the PINx Register, will result in a toggle in the corresponding bit in the Data Register. The Port Input Pins I/O location is read only, while the Data Register and the Data Direction Register are read/write. I will of course delete all the pinholes, to keep only the links I need. The idea is to have ON THE SAME PCB a full Mega 2560 Pro Mini and the other CMS electronic components I need. Ideally a Mega 2560 Pro, as said in the title. I’m looking for an exploded view of an arduino in Fritzing format. Three I/O memory address locations are allocated for each port, one each for the Data Register – PORTx, Data Direction Register – DDRx, and the Port Input Pins – PINx. It probably exists already but I can’t find it. For example, see §14.1 in Atmel doc8271, the ATmega48A/PA/88A/PA/168A/PA/328/P datasheet, which states: This method also uses the fact that an AVR pin – as on most Atmel-based Arduinos – will toggle when you write a 1 to its bit in its input register. But avr-gcc as configured for the Arduino IDE is not so allowed, which is a reasonable default for embedded programming. In some cases the computation could occur at compile time if compiler is smart enough or is allowed to optimize. These functions – digitalPinToPort(), portInputRegister(), and digitalPinToBitMask()– can be used at run time to compute physical ports and pins from Arduino pin numbers. This more-portable method uses some standard (although not well-documented at ) functions to get port numbers, port pointers, and bit masks from a pin number. This answer uses a slightly more portable method of producing a brief pulse on a given digital pin. The other answer has provided correct information and useful documentation on the question as asked.
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