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  2. MCS-51 - Wikipedia

    en.wikipedia.org/wiki/MCS-51

    [3] [48] It can perform as an 8-bit 8051, has 24-bit linear addressing, an 8-bit ALU, 8-bit instructions, 16-bit instructions, a limited set of 32-bit instructions, 16 8-bit registers, 16 16-bit registers (8 16-bit registers which do not share space with any 8-bit registers, and 8 16-bit registers which contain 2 8-bit registers per 16-bit ...

  3. Half-carry flag - Wikipedia

    en.wikipedia.org/wiki/Half-carry_flag

    The Auxiliary Carry flag is set (to 1) if during an "add" operation there is a carry from the low nibble (lowest four bits) to the high nibble (upper four bits), or a borrow from the high nibble to the low nibble, in the low-order 8-bit portion, during a subtraction. Otherwise, if no such carry or borrow occurs, the flag is cleared or "reset ...

  4. Carry flag - Wikipedia

    en.wikipedia.org/wiki/Carry_flag

    The result should be 510 which is the 9-bit value 111111110 in binary. The 8 least significant bits always stored in the register would be 11111110 binary (254 decimal) but since there is carry out of bit 7 (the eight bit), the carry is set, indicating that the result needs 9 bits. The valid 9-bit result is the concatenation of the carry flag ...

  5. AVR microcontrollers - Wikipedia

    en.wikipedia.org/wiki/AVR_microcontrollers

    8-bit AVR XMEGA devices via the PDI 2-wire interface; 8-bit megaAVR and tinyAVR devices via SPI for all with OCD (on-chip debugger) support; 8-bit tinyAVR microcontrollers with TPI support; 32-bit SAM Arm Cortex-M based microcontrollers via SWD; Target operating voltage ranges of 1.62V to 5.5V are supported as well as the following clock ranges:

  6. Compressed instruction set - Wikipedia

    en.wikipedia.org/wiki/Compressed_instruction_set

    In the 6502, which has only a single arithmetic register A, this instruction can be represented entirely by its 8-bit opcode $06. [1] On processors with more registers, all that is needed is the opcode and register number, another 4 or 5 bits. On MIPS, for instance, the instruction needs only a 6-bit opcode and a 5-bit register number.

  7. Accumulator (computing) - Wikipedia

    en.wikipedia.org/wiki/Accumulator_(computing)

    The 8051 microcontroller has two, a primary accumulator and a secondary accumulator, where the second is used by instructions only when multiplying (MUL AB) or dividing (DIV AB); the former splits the 16-bit result between the two 8-bit accumulators, whereas the latter stores the quotient on the primary accumulator A and the remainder in the ...

  8. Adder (electronics) - Wikipedia

    en.wikipedia.org/wiki/Adder_(electronics)

    A full adder can be viewed as a 3:2 lossy compressor: it sums three one-bit inputs and returns the result as a single two-bit number; that is, it maps 8 input values to 4 output values. (the term "compressor" instead of "counter" was introduced in [ 13 ] )Thus, for example, a binary input of 101 results in an output of 1 + 0 + 1 = 10 (decimal ...

  9. Byte addressing - Wikipedia

    en.wikipedia.org/wiki/Byte_addressing

    An eight-bit processor like the Intel 8008 addresses eight bits, but as this is the full width of the accumulator and other registers, this could be considered either byte-addressable or word-addressable. 32-bit x86 processors, which address memory in 8-bit units but have 32-bit general-purpose registers and can operate on 32-bit items with a ...