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The Overflow_Flag and the Sign_Flag are ignored. 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 ...
A status register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor.Examples of such registers include FLAGS register in the x86 architecture, flags in the program status word (PSW) register in the IBM System/360 architecture through z/Architecture, and the application program status register (APSR) in the ARM Cortex-A architecture.
Example: copy the third least significant bit from EAX to the carry flag BT EAX , 2 BTS (Bit Test and Set) operates the same, but also sets the bit in the register, [ 2 ] while BTR (Bit Test and Reset) resets it, [ 3 ] and BTC (Bit Test and Complement) flips it.
N Negative flag. Set to a copy of the most significant bit of an arithmetic result. V Overflow flag. Set in case of two's complement overflow. S Sign flag. Unique to AVR, this is always N⊕V, and shows the true sign of a comparison. H Half-carry flag. This is an internal carry from additions and is used to support BCD arithmetic. T Bit copy.
the carry flag uses a "borrow bit" convention for subtracts, rather than the "carry bit" convention used by Microchip; they also include a signed overflow flag, which like the digit carry, is set by add, subtract and compare instructions (every instruction which sets the carry flag except for shift instructions);
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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 ...
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