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BBFuino come with the ATmega328 controller, loaded with Optiboot (Arduino UNO's bootloader), compatible with Arduino IDE and sample code, design to fit breadboard for prototyping and learning, lower down the cost by taking out the USB to UART IC, so the board has the basic component to operate. BlockDuino [161] ATmega8 ATmega328 Blockduino
The Arduino physical computing platform is based on an ATmega328 microcontroller (ATmega168 or ATmega8 in board versions older than the Diecimila). The ATmega1280 and ATmega2560, with more pinout and memory capabilities, have also been employed to develop the Arduino Mega platform.
ATmega8 [44] 16 MHz Arduino 3.2 in × 2.1 in [ 81.3 mm × 53.3 mm ] DE-9 serial connection native The first board labelled "Arduino". Arduino USB [45] Arduino Yes ATmega8 [44] 16 MHz Arduino 3.2 in × 2.1 in [ 81.3 mm × 53.3 mm ] USB FTDI FT232BM Arduino USB v2.0 Changed: USB replaces RS-232 interface, Improved: Arduino can be powered from host
The default bootloader of the Arduino Uno is the Optiboot bootloader. [33] Boards are loaded with program code via a serial connection to another computer. Some serial Arduino boards contain a level shifter circuit to convert between RS-232 logic levels and transistor–transistor logic level signals.
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The word "uno" means "one" in Italian and was chosen to mark a major redesign of the Arduino hardware and software. [7] The Uno board was the successor of the Duemilanove release and was the 9th version in a series of USB-based Arduino boards. [8] Version 1.0 of the Arduino IDE for the Arduino Uno board has now evolved to newer releases. [4]
debugWIRE is supported by all modern hardware debuggers from Microchip.This includes Atmel-ICE, [3] JTAGICE3, AVR Dragon, JTAGICE mkII, and SNAP. [4] It is also possible to build a cheap debugWIRE hardware debugger [5] based on an open-source Arduino sketch, [6] using a general USB-Serial adaptor or ATtiny85 board, [7] or a CH552 microcontroller.
In addition to these 32 general-purpose registers, the CPU has a few special-purpose registers: PC: 16- or 22-bit program counter; SP: 8- or 16-bit stack pointer