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ST20CX bảng dữ liệu(PDF) 63 Page - STMicroelectronics

tên linh kiện ST20CX
Giải thích chi tiết về linh kiện  Instruction Set Reference Manual
PDF  212 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20CX bảng dữ liệu(HTML) 63 Page - STMicroelectronics

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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.
See also:
devls devlw devsb lb



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