Re: replacing AT90S8515

At 12:22 16/05/2003 +0200, Serafini Alessandro wrote:
>good morning,
>I must change the AVR8515 in my application with the new MEGA8515, but i
>have a big problem: after fuse bit setting (see below for the setting) the
>aplication doesn't work.
>Some data about the application:
>AVR 8515, clock (quartz) = 8 MHz
>no external RAM
>Fuse Bits: SPIEN = 0 (programmed); FSTRT = 0 (programmed)
>Lock Bits: MODE1 selected (no memory lock features enabled)
>
>After reading the AVR085 Application note (replacing AT90S8515 by AT
>mega8515) i select this fuse bits configuration:
>S8515     = 0 (Prog.)
>WDTON   = 1 (Unprog.)
>SPIEN      = 0 (P)
>CKOPT    = 1 (U)

Try CKOPT =1 (Programmed) as your crystal may require a higher drive that 
CKOPT=0 offers.  All other options look okay.  Look at the oscillator 
output (XTAL2) with a scope to verify if CKOPT affects your particular crystal.

Jason Kyle

>EESAVE  = 1 (U)
>BOOTSZ1= 0 (U) ---->I tried also with 1 (P) but nothing change
>BOOTSZ0 = 0 (U)----> i tried also with 1 (P) but nothing change
>BOOTRST = 1 (U)
>BODLEVEL= 1 (U)
>BODEN    = 1 (U)
>SUT1       = 1 (U)
>SUT0       = 0 (P)
>CKSEL3   = 1 (U)
>CKSEL2   = 1 (U)
>CKSEL1   = 1 (U)
>CKSEL0   = 1 (U)
>
>what I have to do to make the Atmega working like the AT90S8515 ?
>
>Best regars
>
>Alessaandro Serafini.
>
>Alessandro Serafini
>MD Micro Detectors s.p.a.
>R&D Department
>Strada S. Caterina, 235
>41100 Modena - Italy
>Tel.: +39 059 420411
>Fax: +39 059 420420
>www.microdetectors.com <http://www.microdetectors.com>
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