ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

lbx

lbx

load byte and sign extend

Code: 2B F9

Description: Load the byte addressed by Areg into Areg and sign extend to a word.

Definition:

Areg′0..7

← byte[Areg]

Areg′8..BitsPerWord-1 ← Areg′7

Error signals: none

Comments:

Secondary instruction.

See also: bsub devlb lb xbword lsx ldul

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