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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM0214 датащи(PDF) 107 Page - STMicroelectronics |
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PM0214 датащи(HTML) 107 Page - STMicroelectronics |
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107 / 245 page  DocID022708 Rev 4 107/245 PM0214 The STM32 Cortex-M4 instruction set 244 3.5.24 USUB16 and USUB8 Unsigned subtract 16 and Unsigned subtract 8 Syntax op{cond}{Rd,} Rn, Rm where: • op is any of: USUB16: Unsigned Subtract 16. USUB8: Unsigned Subtract 8. • ‘cond’ is an optional condition code (see Conditional execution on page 64) • ‘Rd’ is the destination register • ‘Rn’ is the register holding the operand • ‘Rm’ is the second operand register Operation Use these instructions to subtract 16-bit and 8-bit data before writing the result to the destination register: The USUB16 instruction: 1. Subtracts each halfword from the second operand register from the corresponding halfword of the first operand register. 2. Writes the unsigned result in the corresponding halfwords of the destination register. The USUB8 instruction: 1. Subtracts each byte of the second operand register from the corresponding byte of the first operand register. 2. Writes the unsigned byte result in the corresponding byte of the destination register. Restrictions Do not use SP or PC. Condition flags These instructions do not change the flags. Examples USUB16 R1, R0 ; Subtracts halfwords in R0 from corresponding halfword of ; R1 and writes to corresponding halfword in R1 USUB8 R4, R0, R5 ; Subtracts bytes of R5 from corresponding byte in R0 and ; writes to the corresponding byte in R4. |
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