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Discussion Groups | M68HC11 | Problemin downloading vector table

Technical discussions about Freescale Microcontrollers: M68HC11. (Freescale Semiconductor is a Subsidiary of Motorola).

Problemin downloading vector table - jackson_cp - Sep 9 5:37:00 2004

Thanks all of you for the guidance given for us for problems
regarding MC68HCF11 interface. We could interface a chip successfully
with an external RAM and we have downloaded a program into the
External RAM. We have downloaded a LED blink program which uses
software delay. That is working fine.
But still we are facing some problem if we are using interrupts in
our program. And the problem is we are not able to download the
program into external RAM. When the Interrupt vector portion is
downloaded Jbug11 is giving error, the program part is downloaded
successfully . We expect that the vector locations are not being
written into the SRAM. We have assigned vector address from 0xFFC0
onwards.

Here are the steps we have followed to downloaded the program into
the external RAM.
1. The external RAM mapped from the address 0x8000
2. We have used "Embedded GNU" for developing the program.
3. The interrupt vectors are located from the memory location
0xFFC0
4. The settings in the JBug11 are as shown below
"Alter HPRIO on reboot" = Checked
"Allow writing to CONFIG and EEPROM = Unchecked
In the "Memory Map" Tab, in the EEPROM/CONFIG section EEPROM
text box is cleared .
In the "RAM" check box the text Expansion RAM = 8000..FFFF
5. Now the board is connected to COM port of the PC
6. The board is reset and the boot loader is loaded
7. Then I have used LD command to load the .s19 file into the
board.
8. It has written the program part, but it is giving error when
writing into location from 0xFFC0.

Please help us to find a solution for this. What is our requirement
is in a single stretch we have to download both the program memory
and interrupt vector table into same type of memory.




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