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ST20C4 Scheda tecnica(PDF) 63 Page - STMicroelectronics |
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ST20C4 Scheda tecnica(HTML) 63 Page - STMicroelectronics |
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63 / 212 page ![]() devlb 63/212 ® devlb device load byte Code: 2F F0 Description: Perform a device read from memory, a memory-mapped device or a peripheral. The byte 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 later. Definition: if (PeripheralStart ≤ Areg ≤ PeripheralEnd) Areg ′ 0..7 ← PeripheralByte[Areg] else Areg ′ 0..7 ← byte[Areg] Areg ′ 8..31 ← 0 Error signals: none Comments: Secondary instruction. See also: devls devlw devsb lb |
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