GameBoy\Opcode::opcode53 PHP Method

    public static function opcode53(Core $core)
    {
        $temp_var = $core->unsbtub($core->memoryRead($core->registersHL) - 1);
        $core->FZero = $temp_var == 0;
        $core->FHalfCarry = ($temp_var & 0xf) == 0xf;
        $core->FSubtract = true;
        $core->memoryWrite($core->registersHL, $temp_var);
    }