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Format: Bytes Cycles Opcode Addr Mode (Hex) dst opc 2 4 C0 R 4 C1 IR Examples: Given: Register 00H = 55H, register 01H = 02H, register 02H = 17H, and C = "0": RRC 00H . Register 00H = 2AH, C = "1" RRC @01H . Register 01H = 02H, register 02H = 0BH, C = "1" In the first example, if general register 00H contains the value 55H (01010101B), the statement "RRC 00H" rotates this value one bit position to the right. The initial value of bit zero ("1") replaces the carry flag and the initial value of the C flag ("1") replaces bit 7. This leaves the new value 2AH (00101010B) in destination register 00H. The sign flag and overflow flag are both cleared to "0". dst S3C9442/C9444/F9444/C9452/C9454/F9454 SAM88RCRI INSTRUCTION SET SBC — Subtract With Carry SBC dst,src Operation: dst . dst – src – c The source operand, along with the current value of the carry flag, is subtracted from the destination operand and the result is stored in the destination. The contents of the source are unaffected. Subtraction is performed by adding the two's-complement of the source operand to the destination operand. In multiple precision arithmetic, this instruction permits the carry ("borrow") from the subtraction of the low-order operands to be subtracted from the subtraction of high-order operands. Flags: C: Set if a borrow occurred (src > dst); cleared otherwise. Z: Set if the result is "0"; cleared otherwise. S: Set if the result is negative; cleared otherwise. V: Set if arithmetic overflow occurred, that is, if the operands were of opposite sign and the sign of the result is the same as the sign of the source; cleared otherwise. Format: Bytes Cycles Opcode Addr Mode (Hex) dst src opc dst | src 2 4 32 r r 6 33 r lr opc src dst 3 6 34RR 6 35 RIR opc dst src 3 6 36 RIM Examples: Given: R1 = 10H, R2 = 03H, C = "1", register 01H = 20H, register 02H = 03H 更多：https://www.bmcx.com/ , and register 03H = 0AH: SBC R1,R2 . R1 = 0CH, R2 = 03H SBC R1,@R2 . R1 = 05H, R2 = 03H, register 03H = 0AH SBC 01H,02H . Register 01H = 1CH, register 02H = 03H SBC 01H,@02H . Register 01H = 15H,register 02H = 03H, register 03H = 0AH SBC 01H,#8AH . Register 01H = 95H; C, S, and V = "1" In the first example, if working register R1 contains the value 10H and register R2 the value 03H, the statement "SBC R1,R2" subtracts the source value (03H) and the C flag value ("1") from the destination (10H) and then stores the result (0CH) in register R1. SAM88RCRI INSTRUCTION SET S3C9442/C9444/F9444/C9452/C9454/F9454 SCF — Set Carry Flag SCF Operation: C . 1 The carry flag (C) is set to logic one, regardless of its previous value. Flags: C: Set to "1". No other flags are affected. Format: Bytes Cycles Opcode (Hex) opc 1 4 DF Example: The statement SCF sets the carry flag to logic one.