Atmel's AVR ATmega128 + DataFlash - Can't achieve read operation from Dataflash with (SCK Freq) > (Fosc/64)

Nov 03, 2003 1 Replies

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Bartek 22 years ago

Hi. I'm using SPI Dataflash memory AT5DB081B with ATmega128 through SPI. When i set registers SPR1=0 and SPR0=1 (SPI SCK = Fosc/16) readings from memory are bad. Quartz I'm using is 3,6864 Mhz. Slower speeds are ok. There is no limitation in pdf described.

Why???

Bartek.

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Ralph Mason 22 years ago

I use a 128 & a dataflash with clk/2 and the mega clock @ 7.3728 Mhz - no problems.

Perhaps it's a hardware problem?

Ralph

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