ST20C2 datasheet(65/212 Pages) STMICROELECTRONICS

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ST20C2 Datasheet(PDF) 65 Page - STMicroelectronics

Part #	ST20C2

Description	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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65 / 212 page

devlw

65/212

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.

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