ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

devls

devls

device load sixteen

Code: 2F F2

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

peripheral. The 16-bit object addressed by Areg is read into Areg as an unsigned

value. 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′0..15 ← PeripheralSixteen[Areg]

else

Areg′0..15 ← sixteen[Areg]

Areg′16..31

←0

Error signals: none

Comments:

Secondary instruction.

See also: devlb devlw devsb ls

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