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ST20CX Datasheet(PDF) 63 Page - STMicroelectronics

Part # ST20CX
Description  Instruction Set Reference Manual
PDF  212 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20CX Datasheet(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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