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ST20CX Folha de dados(PDF) 67 Page - STMicroelectronics

Nome de Peças ST20CX
Descrição Electrónicos  Instruction Set Reference Manual
PDF  212 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20CX Folha de dados(HTML) 67 Page - STMicroelectronics

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devsb
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®
devsb
device store byte
Code: 2F F1
Description: Perform a device write from memory, a memory-mapped device or a
peripheral. Store the least significant byte of Breg into the byte addressed by 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 store instructions that appear
before it in the code sequence, and before all normal memory stores that appear after
it.
Definition:
if (PeripheralStart
≤ Areg ≤ PeripheralEnd)
PeripheralByte
′[Areg]
← Breg
0..7
else
byte
′[Areg] ← Breg
0..7
Areg
′← Creg
Breg
′← undefined
Creg
′← undefined
Error signals: none
Comments:
Secondary instruction.
See also:
devlb devss devsw sb



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