Weddington, Eric wrote:
But I do find it strange that the AT90USB1287 uses a 3 byte PC for
call/ret and reti, thought it only has 128K of flash.
I find it extremely odd too, and I'm not at all sure that it is correct.
Some investigation will have to be done to verify this information.
unsigned char how_long_is_the_instruction_pointer(void)
{
unsigned sp1=SP; unsigned sp2; //store stack ptr
asm volatile("call rrrtt\r\n rrrtt:\r\n"::); //move stack ptr by
calling
sp2=SP; cli(); SP=sp1; sei(); //restore stack
return sp1-sp2;
}
Result on USB1286 date code 0622 is 2
Result on USB1287 date code 0548 is also 2.
/Kasper Pedersen
(apologies if this one doubles)
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