RE: [avr-libc-dev] Question on stack size in ATmega128 and Errors iniom128.h

[Philip Soeberg]

In normal mode, the mega128 supports 4096bytes of internal sram, whereas in
mode-mega103 it only supports 4000bytes.

The memory maps for SRAM are listed in the datasheet at page 18.
Mode A is usually used, if not wanting backwards compatibility with mega103.

Don't know about the other question you had :)

regards.
-=[ Philip Soeberg ]=[ address@hidden ]=-


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Curtis, Ron
Sent: 9. december 2002 19:01
To: 'address@hidden'
Subject: [avr-libc-dev] Question on stack size in ATmega128 and Errors
iniom128.h

Hi-

   Question on ATmega128:  
Why is the stack initialized to 0x10FF instead of 0x0FFF?

Also,  I had to make the following corrections to iom128.h  to be consistent
in my code.

/* USART Status Register A   ERROR RDC
#define    RXC          7
#define    TXC          6
#define    UDRE         5
#define    FE           4
#define    OVR          3    This definition differs from the databook */
  /*definition to avoid problems with the OR instruction */

/* UCSR0A    correction, RDC  12/2/02*/
#define RXC0    7
#define TXC0    6
#define UDRE0   5
#define FE0     4
#define OVR0    3
#define U2X0    1
#define MPCM0   0

Thanks,
Ron
--------------------------------------------------
Ron Curtis
Technical Fellow
The Boeing Co.
499 Boeing Blvd
MS JN-72, Bld 48-20, Rm 23D.812
Huntsville, AL  35824
256-461-3043 voice
256-461-5815 fax





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