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ST20C2 数据表(PDF) 64 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 64 Page - STMicroelectronics |
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64 / 212 page  devls ® 64/212 devls device load sixteen Code: 2F F2 Description: Perform a device read from memory, a memory-mapped device or a peripheral. The 16-bit object addressed by Areg is read into Areg as an unsigned value. 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 ′ 0..15 ← PeripheralSixteen[Areg] else Areg ′ 0..15 ← sixteen[Areg] Areg ′ 16..31 ← 0 Error signals: none Comments: Secondar y instruction. See also: devlb devlw devsb ls |
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