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ST20C4 Arkusz danych(PDF) 65 Page - STMicroelectronics

Numer części ST20C4
Szczegółowy opis  Instruction Set Reference Manual
PDF  212 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C4 Arkusz danych(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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