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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM0056 датащи(PDF) 88 Page - STMicroelectronics |
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PM0056 датащи(HTML) 88 Page - STMicroelectronics |
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88 / 156 page  The Cortex-M3 instruction set PM0056 88/156 DocID15491 Rev 5 To read the state of the Q flag, use the MRS instruction (see MRS on page 100). Restrictions Do not use either SP or PC. Condition flags These instructions do not affect the condition code flags. If saturation occurs, these instructions set the Q flag to 1. Examples SSATR7, #16, R7, LSL #4; logical shift left value in R7 by 4, then ; saturate it as a signed 16-bit value and ; write it back to R7 USATNER0, #7, R5; conditionally saturate value in R5 as an ; unsigned 7 bit value and write it to R0 3.8 Bitfield instructions Table 29 shows the instructions that operate on adjacent sets of bits in registers or bitfields. Table 29. Packing and unpacking instructions Mnemonic Brief description See BFC Bit field clear BFC and BFI on page 89 BFI Bit field insert BFC and BFI on page 89 SBFX Signed bit field extract SBFX and UBFX on page 89 SXTB Sign extend a byte SXT and UXT on page 90 SXTH Sign extend a halfword SXT and UXT on page 90 UBFX Unsigned bit field extract SBFX and UBFX on page 89 UXTB Zero extend a byte SXT and UXT on page 90 UXTH Zero extend a halfword SXT and UXT on page 90 |
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