ST20C4 datasheet(63/212 Pages) STMICROELECTRONICS

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ST20C4 датащи(PDF) 63 Page - STMicroelectronics

номер детали	ST20C4

подробное описание детали	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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63 / 212 page

devlb

63/212

devlb

device load byte

Code: 2F F0

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

peripheral. The byte 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 later.

Definition:

if (PeripheralStart

≤ Areg ≤ PeripheralEnd)

Areg

′

0..7

← PeripheralByte[Areg]

else

Areg

′

0..7

← byte[Areg]

Areg

′

8..31

← 0

Error signals: none

Comments:

Secondary instruction.

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