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ST20C2 Datenblatt(PDF) 65 Page - STMicroelectronics

Teilenummer ST20C2
Bauteilbeschribung  Instruction Set Reference Manual
PDF  212 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Datenblatt(HTML) 65 Page - STMicroelectronics

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devlw
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®
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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