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Only the JTAG port uses conventional 2.54 mm pinout. All the other AVR I/O ports require more compact 1.27 mm headers. The AVR Dragon can both program and debug since the 32 KB limitation was removed in AVR Studio 4.18, and the JTAGICE mkII is capable of both programming and debugging the processor.
bbb = Bit number (0–7) B = Bit value (0 or 1) kkkk = 4-bit unsigned constant (DES opcode) kkkkkk = 6-bit unsigned constant; KKKKKKKK = 8-bit constant; The Atmel AVR uses many split fields, where bits are not contiguous in the instruction word. The most commonly encountered is the 5-bit source register field in bits 9 and 3–0.
TRUNK-1 Trunk-1 0x18 24 TRUNK-2 Trunk-2 0x19 25 LEAF-1 Leaf-1 0x1A 26 LEAF-2 Leaf-2 0x1B 27 RDP Reliable Data Protocol: RFC 908: 0x1C 28 IRTP Internet Reliable Transaction Protocol: RFC 938: 0x1D 29 ISO-TP4 ISO Transport Protocol Class 4 RFC 905: 0x1E 30 NETBLT Bulk Data Transfer Protocol: RFC 998: 0x1F 31 MFE-NSP MFE Network Services Protocol ...
Up to 4 pins may be required for implementing a JTAG standard interface. In general, modern protocols try to keep the number of pins used low, typically to 2 pins. Some ISP interfaces manage to achieve the same with just a single pin. Newer ATtiny microcontrollers with UPDI can even reuse that programming pin also as a general-purpose input ...
ATtiny (also known as TinyAVR) is a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).
[1] Many of Atmel's microcontrollers in this line have similar instruction sets, so if an engineer learns the instruction set from one of their microprocessors, this knowledge is transferable to other microcontrollers in the line. The ATmega168 is a variant with 16 KB Flash memory. [2]
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ATmega328 is commonly used in many projects and autonomous systems where a simple, low-powered, low-cost micro-controller is needed. Perhaps the most common implementation of this chip is on the popular Arduino development platform, namely the Arduino Uno, Arduino Pro Mini [4] and Arduino Nano models.