Hello Balok,
You may find a little more variation in the CW examples given for the various HC08 devices. While not directly applicable to your board, they can probably be easily adaped - some of the labels associated the peripheral registers may differ slightly.
Your immediate problem sounds quite simple. Since you are using external hardware to switch power to the device, you don't have to worry about the use of any of the stop modes. Do any of your tasks require non-volatile data to be stored in flash? I presume that you are using separate inputs for each key (not a matrix key pad) in order to implement the power control.
I did something like this a couple of years ago, using one of the HC08 devices. In this case, the project ran off a couple of lithium cells.
Regards,
Mac