ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

csub0

csub0

check subscript from 0

Code: 21 F3

Description: Check that Breg is in the range 0..(Areg-1), interpreting Areg and Breg

as unsigned numbers.

Definition:

if (Bregunsigned ≥ Aregunsigned)

Integer Error

Areg′ ← Breg

Breg′ ← Creg

Creg′ ← undefined

Error signals:

IntegerError signalled if Breg is not in range.

Comments:

Secondary instruction.

See also: ccnt1

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