ST20CX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20CX

Instruction Set Reference Manual

STMicroelectronics 

devsw

devsw

device store word

Code: 2F F5

Description: Perform a device write from memory, a memory-mapped device or a

peripheral. Store Breg into the word of memory 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)

PeripheralWord′[Areg] ← Breg

else

word′[Areg] ← Breg

Areg′ ← Creg

Breg′ ← undefined

Creg′ ← undefined

Error signals: none

Comments:

Secondary instruction.

See also: devlw devsb devss stnl

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