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  1. or download this
    use warnings;
use strict;
...

my $num = 1023; # 0x03ff
my ($b1, $b2);
  2. or download this
    $b1 = ($num & 0xff00) >> 8;
$b2 = $num & 0xff;

printf("%x, %x\n", $b1, $b2); # 3, ff
  3. or download this
    $b1 = $num & 0xff;
$b2 = ($num & 0xff00) >> 8;

printf("%x, %x\n", $b1, $b2); # ff, 3
  4. or download this
    use warnings;
use strict;
...
$b2 = ($num & 0xff00) >> 8;

printf("%x, %x\n", $b1, $b2);