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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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PM0223 Fiches technique(PDF) 63 Page - STMicroelectronics |
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PM0223 Fiches technique(HTML) 63 Page - STMicroelectronics |
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63 / 110 page  DocID025763 Rev 1 63/110 PM0223 The STM32L0 Cortex-M0+ Instruction Set 80 3.5.8 SXT and UXT Sign extend and Zero extend. Syntax SXTB Rd, Rm SXTH Rd, Rm UXTB Rd, Rm UXTH Rd, Rm where: Operation • These instructions extract bits from the resulting value: • SXTB extracts bits[7:0] and sign extends to 32 bits. • UXTB extracts bits[7:0] and zero extends to 32 bits. • SXTH extracts bits[15:0] and sign extends to 32 bits. • UXTH extracts bits[15:0] and zero extends to 32 bits. Restrictions In these instructions, Rd and Rm must only specify R0-R7. Condition flags These instructions do not affect the flags. Examples SXTH R4, R6 ; Obtain the lower halfword of the ; value in R6 and then sign extend to ; 32 bits and write the result to R4. UXTB R3, R1 ; Extract lowest byte of the value in R10 and zero ; extend it, and write the result to R3 Rd Is the destination register. Rm Is the register holding the value to be extended. |
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