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PM0214 Fiches technique(PDF) 172 Page - STMicroelectronics

No de pièce PM0214
Description  This programming manual provides information
PDF  245 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0214 Fiches technique(HTML) 172 Page - STMicroelectronics

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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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