Table of Contents
Previous topic Next topic
MICROPROCESSOR INSTRUCTION REFERENCE->FF1
FF1 Find First One in Register
Compatibility: MCF5282 and MCF5280.
Bit offset of the first logical one in Dx -> Dx
|Assembler Syntax:||FF1.L Dx|
The data register is scanned beginning from the most-significant bit (Dx) and ending with the lease-significant bit (Dx) searching for the first bit set. The data register is then loaded with the offset count from bit 31 where the first bit set appears. If the data source is zero then an offset if 32 is returned.
N Set if source was negative, else cleared
Z Set if source was zero, else cleared
V Always cleared
C Always cleared
X Not affected