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$clock = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF05';

use warnings;
use strict;
...
for (split //, $clock) {
    print "$_:", ord $_, ":\n";
}

clock:\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uff
+ff\uffff\uffff\uffff\uffff\uffff:
\uffff:255:
...
\uffff:255:
\uffff:255:
:5:

$clock = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF05';
$clock = 'F' x 32 . '05';