ST20CX 查看數據表（PDF） - STMicroelectronics

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ST20CX

Instruction Set Reference Manual

STMicroelectronics 

cword

cword

check word

Code: 25 F6

Description: Check that the value in Breg can be represented as an N-bit signed

integer. Areg contains 2(N-1) to indicate the value of N (i.e. bit N-1 of Areg is set to 1

and all other bits are set to zero).

Definition:

if (Breg < −Areg) or (Breg ≥ Areg)

IntegerError

Areg′ ← Breg

Breg′ ← Creg

Creg′ ← undefined

Error signals:

IntegerError signalled if Breg is not in range.

Comments:

The result of the instruction is undefined if Areg is not an integral power of 2.

Undefined if Areg has more than one bit set.

Secondary instruction.

See also: cb cs csngl xword

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