topic Flash function - QE 8 micro in 8-bit Microcontrollers

Flash function - QE 8 micro

JulsPower — Thu, 11 Dec 2008 01:37:40 GMT

Hi
Im working with the QE8 micro
I would like to do some read write operation in non volatile memory
but I wasn't able to find any C example for HCS08 about flash.

Someone know where I could find this?

thanks

ps I tried the search function

Message Edited by JulsPower on 2008-12-10 05:37 PM

Added p/n to subject.

Message Edited by NLFSJ on 2008-12-17 07:49 AM

Re: Flash function

Ake — Thu, 11 Dec 2008 17:57:28 GMT

Hi,

I have an example how to use the Flash EPROM in a 9S08QE8 as an EEPROM.

It reads/writes data at 0xF800. If you want to use the protection of your program memory, this should be moved downto 0xE000.

The files are compressed with WinZip, so unzip it before you can try it.

I am including a technical paper describing how the Flash EPROM routines work.

Regards,

Ake

S08_Flash_QE8.zip

TN228.pdf

Message Edited by t.dowe on 2009-10-27 11:59 AM

Re: Flash function

JulsPower — Thu, 11 Dec 2008 21:48:16 GMT

Great thanks
this seem to bewhat i was looking for

Re: Flash function

jerryn — Thu, 18 Dec 2008 03:58:07 GMT

Regarding the relocation of the flash code to ram.....is this necessary only if you need to erase the entire flash, or can the flash functions be run out of flash in the normal fashion?

Also, I tried using the S08_flash functions, while connected with a debugger, but do not see the memory change.

I used the initializer to set the FCDIV register, and I verified that 0x42 was sent, and that after reset the register reads 0xC2, as expected, so I did not call the FlashInit() function.

I ran the following, then checked the memory location with the debugger, but it is still 0cFF

if(Flash_Erase(0xFE00))
{
i=9;
}
ucInput = 0x5A;
if(Flash_Program(0xFE00,ucInput))
{
i=9;
}

Is there something else that I need to do to get the flash to be programmed?

Thanks,

Jerry

Re: Flash function

jerryn — Thu, 18 Dec 2008 09:17:40 GMT

I tested the code after doing the relocation thing, and running the Flash_Functions out of ram, without success....get an "illegal breakpoint" in the debugger cmd screen.

Prior to running out of RAM, I would see that the memory around 0x80 would get zeroed out after calling the flash function just to write a single byte.

A couple of times, a couple of bytes were successfully programmed, but success was not repeatable with an erase, then a program.

Jerry

Re: Flash function

roja — Fri, 06 Aug 2010 16:28:44 GMT

Hi Jerry

how did you solve the problem you have posted at the end ie., the program control going to some location 80

roja