ST20CX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20CX

Instruction Set Reference Manual

STMicroelectronics 

bitrevnbits

bitrevnbits

reverse bottom n bits in word

Code: 27 F8

Description: Reverse the order of the bottom Areg bits of Breg.

Definition:

if (0 ≤ Areg) and (Areg ≤ BitsPerWord)

{

Areg′0..Areg-1

← reversed Breg0..Areg-1

Areg′Areg..BitsPerWord-1 ← 0

}

else

Undefined effect

Breg′ ← Creg

Creg′ ← undefined

Error signals: none

Comments:

Secondary instruction.

The effect of the instruction is undefined if the n umber of bits specified is more

than the word length.

See also: bitrevword

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