John Regehr <reg...@cs.utah.edu> wrote: > Is it not sufficient for the maximum extent of the stack to be 256 > bytes?
Only if the stack starts at a 0xXXFF address. As RAMEND on the ATmega3290 is equal 0x8FF, this is by default the case on that MCU type. Other MCU types (in particular older AVRs) have a RAMEND of e.g. 0x25F. In that case, the stack could only extend to 0x60 bytes before changing SPH were due. (Alternatively, the stack could be relocated to a lower address, e.g. 0x1FF.) -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
