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PM0215 bảng dữ liệu(PDF) 55 Page - STMicroelectronics

tên linh kiện PM0215
Giải thích chi tiết về linh kiện  STM32F0xxx Cortex-M0 programming manual
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PM0215 bảng dữ liệu(HTML) 55 Page - STMicroelectronics

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PM0215
The STM32 Cortex-M0 instruction set
Doc ID 022979 Rev 1
55/91
3.5.6
MULS
Multiply using 32-bit operands, and producing a 32-bit result.
Syntax
MULS Rd, Rn, Rm
where:
●
‘Rd’ is the destination register
●
‘Rn, Rm’ are registers holding the values to be multiplied.
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 Conditional execution on page 39.
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. It does not affect the C or
V flags.
Examples
MULS
R0, R2, R0
; Multiply with flag update, R0 = R0 x R2



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