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PM0056 bảng dữ liệu(PDF) 86 Page - STMicroelectronics

tên linh kiện PM0056
Giải thích chi tiết về linh kiện  This programming manual provides information
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PM0056 bảng dữ liệu(HTML) 86 Page - STMicroelectronics

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The Cortex-M3 instruction set
PM0056
86/156
DocID15491 Rev 5
3.6.3
SDIV and UDIV
Signed divide and unsigned divide.
Syntax
SDIV{cond} {Rd,} Rn, Rm
UDIV{cond} {Rd,} Rn, Rm
where:
‘cond’ is an optional condition code (see Conditional execution on page 57)
‘Rd’ is the destination register. If Rd is omitted, the destination register is Rn
‘Rn,’ is the register holding the value to be divided
‘Rm’ is a register holding the divisor
Operation
SDIV performs a signed integer division of the value in Rn by the value in Rm.
UDIV performs an unsigned integer division of the value in Rn by the value in Rm.
For both instructions, if the value in Rn is not divisible by the value in Rm, the result is
rounded towards zero.
Restrictions
Do not use either SP or PC.
Condition flags
These instructions do not change the flags.
Examples
SDIVR0, R2, R4; signed divide, R0 = R2/R4
UDIVR8, R8, R1; unsigned divide, R8 = R8/R1



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