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PM0214 bảng dữ liệu(PDF) 138 Page - STMicroelectronics |
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PM0214 bảng dữ liệu(HTML) 138 Page - STMicroelectronics |
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138 / 245 page  The STM32 Cortex-M4 instruction set PM0214 138/245 DocID022708 Rev 4 3.9.2 SBFX and UBFX Signed Bit Field Extract and Unsigned Bit Field Extract. Syntax SBFX{cond} Rd, Rn, #lsb, #width UBFX{cond} Rd, Rn, #lsb, #width where: • ‘cond’ is an optional condition code, see Conditional execution on page 64. • ‘Rd’ is the destination register. • ‘Rn’ is the source register. • ‘lsb’ is the position of the least significant bit of the bitfield. lsb must be in the range 0 to 31. • ‘width’ is the width of the bitfield and must be in the range 1 to 32-lsb. Operation SBFX extracts a bitfield from one register, sign extends it to 32 bits, and writes the result to the destination register. UBFX extracts a bitfield from one register, zero extends it to 32 bits, and writes the result to the destination register. Restrictions Do not use SP and do not use PC. Condition flags These instructions do not affect the flags. Examples SBFX R0, R1, #20, #4 ; Extract bit 20 to bit 23 (4 bits) from R1 and sign ; extend to 32 bits and then write the result to R0. UBFX R8, R11, #9, #10; Extract bit 9 to bit 18 (10 bits) from R11 and zero ; extend to 32 bits and then write the result to R8 |
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