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ST20C2 数据表(PDF) 68 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 68 Page - STMicroelectronics |
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68 / 212 page  devss ® 68/212 devss device store sixteen Code: 2F F3 Description: Perform a device write from memory, a memory-mapped device or a peripheral. Store bits 0..5 of Breg into the sixteen bits addressed by Areg. A memory access performed by this instruction is guaranteed to be correctly sequenced with respect to other device-access instructions. Also the instruction is guaranteed to be executed after all normal memory store instructions that appear before it in the code sequence, and before all normal memory stores that appear after it. Definition: if (PeripheralStart ≤ Areg ≤ PeripheralEnd) PeripheralSixteen ′[Areg]← Breg 0..15 else sixteen ′[Areg] ← Breg 0..15 Areg ′← Creg Breg ′← undefined Creg ′← undefined Error signals: none Comments: Secondar y instruction. See also: devls devsb devsw ss |
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