topic Re: RAM1 usage on RS08LE4 in 8-bit Microcontrollers

RAM1 usage on RS08LE4

UtopiaTim — Tue, 23 Dec 2008 00:12:11 GMT

Hi Folks,

Have a similar question up on the CW forum, but figured perhaps there are

some that have encountered this problem & don't read that forum.

Got a fixup error when compiling my LE4 code (CW6.2). Found that I had

overflowed the amount of memory in the RAM array. (the LE4 has both RAM

@ $50-BF & RAM1 @ $100-17F).

How do I get CW to use that array? It would need to do a PAGSEL to get to

it, but CW does that all the time with various registers that aren't in the bottom

page of memory.

The .PRM file has:

RAM = READ_WRITE 0x0050 TO 0x00BF;

RAM1 = READ_WRITE 0x01200 TO 0x017F

....

DEFAULT_RAM INTO RAM, RAM1, TINY_RAM

In the .MAP file, as long as I keep below the top of RAM, there's no problem

(OBJECT LIST SORTED BY ADDRESS). As soon as I add a variable that

puts it over, then I get the Fixup error and see the address as $100 in the map file.

Just wondering if anybody else has seen this.

Thanks,

Tim

Re: RAM1 usage on RS08LE4

CrasyCat — Tue, 23 Dec 2008 17:24:19 GMT

Hello

I would recommend you to take a look at FAQ-28840 on www.freescale.com.

That should give you advice on how to define/use variable outside of 0x00..0xFF on RS08 MCus.

CrasyCat

Re: RAM1 usage on RS08LE4

UtopiaTim — Tue, 23 Dec 2008 23:11:54 GMT

Hi Crasy,

Thanks for the info, but it sure seems to be a big deal to have to go through

all of that, as CW already does a good job of using the page register on

the registers that are not in 0-ff.

Tim

Re: RAM1 usage on RS08LE4

ProcessorExpert — Fri, 09 Jan 2009 21:55:36 GMT

The problem with access to the RAM1 memory on LE4 in Processor Expert has been answered here.

best regards
Vojtech Filip
Processor Expert Support Team
UNIS