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Rotate through carry is a variant of the rotate operation, where the bit that is shifted in (on either end) is the old value of the carry flag, and the bit that is shifted out (on the other end) becomes the new value of the carry flag. A single rotate through carry can simulate a logical or arithmetic shift of one position by setting up the ...
Another example may be an 8-bit register with the bit pattern 01010101 and the carry flag set; if we execute a rotate left through carry instruction, the result would be 10101011 with the carry flag cleared because the most significant bit (bit 7) was rotated into the carry while the carry was rotated into the least significant bit (bit 0).
These do not have a destination select bit, and include three "compare and skip" instructions which do not write a result, and two "rotate without carry" instructions. This instruction set is not used in any currently manufactured part and is of historical interest only.
Rotate through carry ALU shift operations cause operand A (or B) to shift left or right (depending on the opcode) and the shifted operand appears at Y. Simple ALUs typically can shift the operand by only one bit position, whereas more complex ALUs employ barrel shifters that allow them to shift the operand by an arbitrary number of bits in one ...
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RR A (rotate right) INC A: 1y: JBC bit, offset (jump if bit set with clear) LCALL addr16: RRC A (rotate right through carry) DEC A: 2y: JB bit, offset (jump if bit set) RET: RL A (rotate left) ADD A, #data: 3y: JNB bit, offset (jump if bit clear) RETI: RLC A (rotate left through carry) ADDC A, #data: 4y: JC offset (jump if carry set) ORL ...
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Stargazers should prepare to lose sleep on Tuesday, Aug. 12, as two celestial sights unfold. The first event will be visible before sunrise and will feature the two brightest planets in the sky ...