AVR-Chat

As a longtime user of micros (since the Intel 4004), I know about the
necessity of initializing the stack pointer in those devices which have it.

However, some of the most recent Atmel datasheets (for example
doc2586.pdf, 2586F dated 4/06 on the tiny 25/45/85) lead me to believe
that Atmel has gone the way of initializing the stack pointer to the top
of SRAM at reset/powerup time.  In this doc (2586F), paragraph 5.6.1
shows the "Initial Value" to be "RAMEND".

This is great if true, BUT in the paragraph above it (par. 5.6) it says
"This Stack space in the data SRAM must be defined by the program before
any subroutine calls are executed or interrupts are enabled. The Stack
Pointer must be set to point above 0x60."

Also an answer to FAQ on the Atmel website that I read says "For all AVR
devices with SRAM the stack pointer must be set to point at the last
address in SRAM."  [I should note that this is not exactly true -- it
can be set anywhere in SRAM, just as long as there is enough room in
SRAM addresses below it to accommodate anything pushed on the stack!]

So the question is "Which is correct?"   Is the stack pointer in these
newer devices initialized as shown so that the programmer does not need
to do the initialization?

Regards,
Don

-- 
I Haven't Lost My Mind - It's Backed Up On Disk Somewhere