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ST20C2 数据表(PDF) 69 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 69 Page - STMicroelectronics |
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69 / 212 page  devsw 69/212 ® devsw device store word Code: 2F F5 Description: Perform a device write from memory, a memory-mapped device or a peripheral. Store Breg into the word of memory addressed by Areg. The 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) PeripheralWord ′[Areg] ← Breg else word ′[Areg] ← Breg Areg ′← Creg Breg ′← undefined Creg ′← undefined Error signals: none Comments: Secondary instruction. See also: devlw devsb devss stnl |
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