$clock = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF05';

##</code><code>##

use warnings;
use strict;

my $clock = pack('H34','FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF05');
print "clock:$clock:\n";
for (split //, $clock) {
    print "$_:", ord $_, ":\n";
}

##</code><code>##

clock:\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff\uffff:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
\uffff:255:
:5:

##</code><code>##

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