package CPU::Emulator::6502::Op::DEY;
use strict;
use warnings;
use constant INSTRUCTIONS => {
0x88 => {
cycles => 2,
code => \&dey,
}
};
=head1 NAME
CPU::Emulator::6502::Op::DEY - Decrement the Y register
=head1 SYNOPSIS
=head1 DESCRIPTION
=head1 METHODS
=head2 dey( )
Decrements the Y register by 1.
=cut
sub dey {
my $self = shift;
my $reg = $self->registers;
$reg->{ y } = ( $reg->{ y } - 1 ) & 0xff;
$self->set_nz( $reg->{ y } );
}
=head1 AUTHOR
Brian Cassidy E<lt>bricas@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2007 by Brian Cassidy
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=head1 SEE ALSO
=over 4
=item * L<CPU::Emulator::6502>
=back
=cut
1;