ST20C4 datasheet(68/212 Pages) STMICROELECTRONICS

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ST20C4 Datenblatt(PDF) 68 Page - STMicroelectronics

Teilenummer	ST20C4

Bauteilbeschribung	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

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68 / 212 page

devss

68/212

devss

device store sixteen

Code: 2F F3

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

peripheral. Store bits 0..5 of Breg into the sixteen bits addressed by Areg. A 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)

PeripheralSixteen

′[Areg]← Breg

0..15

else

sixteen

′[Areg] ← Breg

0..15

Areg

′← Creg

Breg

′← undefined

Creg

′← undefined

Error signals: none

Comments:

Secondar y instruction.

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