- I have been using the 68HC11 in most all my products since 1990.
- I began using the Cosmic C compiler and Multi-Edit in 1998.
- In 2003 I incorporated the STMicorelectronics PSD854F2 for all RAM, ROM, addressing logic and some I/O.
- This was a great space saver and I got more memory than with the discretes I had been using.
- Programming was easy: I just used the JTAG port pins and software provided by STMicro
- Now the PSD parts have all gone obsolete.
- This means I must redsign my boards.
- I want to stay with Freescale products
- I want to stay with Cosmic
- I want to upgrade to a more recent and more powerful uProcessor
- I am considering the MC9S12A512 as my replacement device
- It has plenty of program and storage flash memory onboard
- It has plenty of I/O
- It has enough onboard RAM for all my products except one and I can add external RAM for it.
- An alternative might be the MC9S12XA512. It has 32K RAM and this would be adequate.
- You can get an idea of my product line by looking at www.valquest.net
- Does the MC9S12A512 seem reasonable for my products?
- Is it reasonable to assume that I can run single chip (no external RAM or ROM)?
- If so, how do I program it.
- There does not seem to be any JTAG entrance to the chip
- I have seen some information about LRAE but I am concerned about:
i. Programming speed
ii. What if the LRAE flash area accidentally gets erased?
- Is there an alternative way to program it?
- Does Cosmic have any programming tools and/or software for these chips?
- I see that Cosmic has XGATE development tools. What exactly is XGATE?
- Could a MC9S12XA512 help me because of XGATE?
Valquest Systems, Inc.