One trap can be interrupts may effect times (may not be in this case though).
Turn interrupts off, then do nops, then turn interrupts on.
CLI
nop
.
.
.
nop
SEI
One trap can be interrupts may effect times (may not be in this case though).
Turn interrupts off, then do nops, then turn interrupts on.
CLI
nop
.
.
.
nop
SEI