ST20CX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20CX

Instruction Set Reference Manual

STMicroelectronics 

devlw

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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