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SAM88RCRI INSTRUCTION SET S3C9442/C9444/F9444/C9452/C9454/F9454 RET — Return RET Operation: PC . @SP SP . SP + 2 The RET instruction is normally used to return to the previously executing procedure at the end of a procedure entered by a CALL instruction. The contents of the location addressed by the stack pointer are popped into the program counter. The next statement that is executed is the one that is addressed by the new program counter value. Flags: No flags are affected. Format: Bytes Cycles Opcode (Hex) opc 1 8 AF 10 Example: Given: SP = 0BCH, (SP) = 101AH, and PC = 1234: RET . PC = 101AH, SP = 0BEH The statement "RET" pops the contents of stack pointer location 0BCH (10H) into the high byte of the program counter. The stack pointer then pops the value in location 0BDH (1AH) into the PC's low byte and the instruction at location 101AH is executed. The stack pointer now points to memory location 0BEH. S3C9442/C9444/F9444/C9452/C9454/F9454 SAM88RCRI INSTRUCTION SET RL — Rotate Left RL dst Operation: C . dst (7) dst (0) . dst (7) dst (n + 1) . dst (n), n = 0–6 The contents of the destination operand are rotated left one bit position. The initial value of bit 7 is moved to the bit zero (LSB) position and also replaces the carry flag. C 7 0 Flags: C: Set if the bit rotated from the most significant bit position (bit 7) was "1". Z: Set if the result is "0"; cleared otherwise. S: Set if the result bit 7 is set; cleared otherwise. V: Set if arithmetic overflow occurred, that is, if the sign of the destination changed during rotation; cleared otherwise. Format: Bytes Cycles Opcode Addr Mode (Hex) dst opc 2 4 90 R 4 91 IR Examples: Given: Register 00H = 0AAH, register 01H = 02H and register 02H = 17H: RL 00H . Register 00H = 55H, C = "1" RL @01H . Register 01H = 02H 更多：https://www.bmcx.com/ , register 02H = 2EH, C = "0" In the first example, if general register 00H contains the value 0AAH (10101010B), the statement "RL 00H" rotates the 0AAH value left one bit position, leaving the new value 55H (01010101B) and setting the carry and overflow flags. dst SAM88RCRI INSTRUCTION SET S3C9442/C9444/F9444/C9452/C9454/F9454 RLC — Rotate Left Through Carry RLC dst Operation: dst (0) . C C . dst (7) dst (n + 1) . dst (n), n = 0–6 The contents of the destination operand with the carry flag are rotated left one bit position. The initial value of bit 7 replaces the carry flag (C); the initial value of the carry flag replaces bit zero. C 7 0 Flags: C: Set if the bit rotated from the most significant bit position (bit 7) was "1". Z: Set if the result is "0"; cleared otherwise. S: Set if the result bit 7 is set; cleared otherwise. V: Set if arithmetic overflow occurred, that is, if the sign of the destination changed during rotation; cleared otherwise. Format: Bytes Cycles Opcode Addr Mode (Hex) dst opc 2 4 10 R 4 11 IR