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ST20C2 データシート(PDF) 65 Page - STMicroelectronics |
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ST20C2 データシート(HTML) 65 Page - STMicroelectronics |
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65 / 212 page  devlw 65/212 ® devlw device load word Code: 2F F4 Description: Perform a device read from memory, a memory-mapped device or a peripheral. The word addressed by Areg is read into 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 load instructions that appear before it in the code sequence, and before all normal memory loads that appear after it. Definition: if (PeripheralStart ≤ Areg ≤ PeripheralEnd) Areg ′← PeripheralWord[Areg] else Areg ′← word[Areg] Error signals: none Comments: Secondary instruction. See also: devlb devls devsw ldnl |
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