S12 / MagniV MicrocontrollersのトピックRe: Utility of protecting flash ?

Utility of protecting flash ?

Gizzzmo — Mon, 05 Jun 2006 20:47:34 GMT

I've seen the FPROT byte in the datasheet but i wonder what's his utility. Is it necessary to protect some areas of the flash ?

Thx

Re: Utility of protecting flash ?

Gizzzmo — Mon, 05 Jun 2006 21:48:24 GMT

To be more accurate, i want to know what can't i do in a protected area.

Re: Utility of protecting flash ?

rhinoceroshead — Mon, 05 Jun 2006 21:51:36 GMT

It's there so you can erase the Flash without erasing a bootloader (if you use one), and also so that you don't accidentally erase your program if you have buggy code that erases Flash.

Re: Utility of protecting flash ?

Gizzzmo — Mon, 05 Jun 2006 21:55:58 GMT

This protection works if the code is executed from the flash ? from the ram ?

If i disable the protection will the interrupt vector table still be write protected ?

Thx

Re: Utility of protecting flash ?

rhinoceroshead — Mon, 05 Jun 2006 22:23:04 GMT

You can do anything except program and erase Flash in the addresses protected by the FPROT register.

You CAN still erase that Flash if you use the BDM.

Re: Utility of protecting flash ?

rhinoceroshead — Mon, 05 Jun 2006 22:25:41 GMT

This protection works regardless of where code is being executed from. If you disable this protection, the interrupt vector table is NOT write protected and can be programmed using the Flash programming algorithm for that particular device.