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PM0223 数据表(PDF) 61 Page - STMicroelectronics |
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PM0223 数据表(HTML) 61 Page - STMicroelectronics |
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61 / 110 page  DocID025763 Rev 1 61/110 PM0223 The STM32L0 Cortex-M0+ Instruction Set 80 3.5.6 MULS Multiply using 32-bit operands, and producing a 32-bit result. Syntax MULS Rd, Rn, Rm where: Operation The MUL instruction multiplies the values in the registers specified by Rn and Rm, and places the least significant 32 bits of the result in Rd. The condition code flags are updated on the result of the operation, see 3.3.6: Conditional execution on page 43. The results of this instruction does not depend on whether the operands are signed or unsigned. Restrictions In this instruction: • Rd , Rn, and Rm must only specify R0-R7. • Rd must be the same as Rm. Condition flags This instruction: • Updates the N and Z flags according to the result. • Does not affect the C or V flags. Examples MULS R0, R2, R0 ; Multiply with flag update, R0 = R0 x R2 Rd Is the destination register. Rn, Rm Ire registers holding the values to be multiplied. |
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