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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) 172 Page - STMicroelectronics |
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PM0214 датащи(HTML) 172 Page - STMicroelectronics |
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172 / 245 page  The STM32 Cortex-M4 instruction set PM0214 172/245 DocID022708 Rev 4 3.11.3 DMB Data memory barrier. Syntax DMB{cond} where: ‘cond’ is an optional condition code, see Conditional execution on page 64. Operation DMB acts as a data memory barrier. It ensures that all explicit memory accesses that appear, in program order, before the DMB instruction are completed before any explicit memory accesses that appear, in program order, after the DMB instruction. DMB does not affect the ordering or execution of instructions that do not access memory. Condition flags This instruction does not change the flags. Examples DMB ; Data Memory Barrier 3.11.4 DSB Data synchronization barrier. Syntax DSB{cond} where: ‘cond’ is an optional condition code, see Conditional execution on page 64. Operation DSB acts as a special data synchronization memory barrier. Instructions that come after the DSB, in program order, do not execute until the DSB instruction completes. The DSB instruction completes when all explicit memory accesses before it complete. Condition flags This instruction does not change the flags. Examples DSB ; Data Synchronisation Barrier |
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