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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) 91 Page - STMicroelectronics |
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PM0056 датащи(HTML) 91 Page - STMicroelectronics |
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91 / 156 page  DocID15491 Rev 5 91/156 PM0056 The Cortex-M3 instruction set Operation These instructions do the following: 1. Rotate the value from Rm right by 0, 8, 16 or 24 bits. 2. 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 Do not use SP and do not use PC. Condition flags These instructions do not affect the flags. Examples SXTH R4, R6, ROR #16 ; Rotate R6 right by 16 bits, then obtain the lower ; halfword of the result and then sign extend to ; 32 bits and write the result to R4. UXTB R3, R10 ; Extract lowest byte of the value in R10 and zero ; extend it, and write the result to R3 3.8.4 Branch and control instructions Table 30 shows the branch and control instructions: Table 30. Branch and control instructions Mnemonic Brief description See BBranch B, BL, BX, and BLX on page 92 BL Branch with Link B, BL, BX, and BLX on page 92 BLX Branch indirect with Link B, BL, BX, and BLX on page 92 BX Branch indirect B, BL, BX, and BLX on page 92 CBNZ Compare and Branch if Non Zero CBZ and CBNZ on page 93 CBZ Compare and Branch if Non Zero CBZ and CBNZ on page 93 IT If-Then IT on page 94 TBB Table Branch Byte TBB and TBH on page 96 TBH Table Branch Halfword TBB and TBH on page 96 |
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