Another way would be to use a higher level language to execute from RAM. You would use the program in FLASH as boot/init and a interpreter for the bytecodes in RAM. In this case, macro/bytecodes would be located even in I2C 64K memories, maybe upto 256K, and loaded for execution in a RAM area, where it would be interpreted. It can be a slower method, but its very extensible. Marcelo
----- Original Message ----- From: "David Brown" <da...@westcontrol.com> To: <mspgcc-users@lists.sourceforge.net> Sent: Tuesday, October 12, 2004 5:45 AM Subject: Re: [Mspgcc-users] more than 60KByte of program code > What you need to do is create an external databus. The msp430 does not have > a dedicated external bus, but it is quite possible to bit-bang a bus. Use > all 8 bits of a port as the databus, and some other lines as control > signals. Whether you want other ports to be used as address lines, or to > use external latches depends on how many free pins you have on the msp430. > Then you can connect up standard 8-bit wide (or 16-bit, if you really want) > asynchronous memories and control them "manually" from the msp430. You > won't be able to access the external memory directly (using pointers, for > example), but will have to go through functions to read from and write to > the external memory. I've used this technique on a number of systems (I > have a Cop8 processor connected to 4 MB flash in this way). > > The msp430 can execute code from RAM, so it is possible to copy code from > the external memory into internal RAM and run it there. However, I expect > that would quickly get complicated (and slow, as you have to copy all the > time) since you don't have huge amounts of RAM space to place with. Putting > strings in the external memory, however, will work well, and give you plenty > of room for multi-lingual versions, etc. > > David > > > > > > Hello, > > > > Is it possible to use external memory (ROM, RAM, FLASH) with the msp430 > > which holds executable program instructions? So it is possible to make > > programs which are bigger than 60KByte? > > > > I know that the answer is 'No'. But does anyone have a creative solution. > > > > We have applications which extend the 60KByte program code. A big part of > > the code is text string, which are used by the menu user interface. > > Currently we are using de intel C196 processor for these applications. The > > C196 can use external memory. And program code is in a page switching > flash > > memory. The C196 is getting obsolete. So we are looking to alternatives. > We > > uses the MSP430F149 is used in a number of (smaller) projects. > > > > Of course it is possible to use another processor. Should we? > > Or is there a way to still use the MSP. > > > > Thanks Robert Bon. > > > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: IT Product Guide on ITManagersJournal > Use IT products in your business? Tell us what you think of them. Give us > Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more > http://productguide.itmanagersjournal.com/guidepromo.tmpl > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users >
