Re: [avr-gcc-list] TWI pullup resisor values

[Andreas Krause]

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Douglas Dotson wrote:
> I am trying to communicate with an I2C
> device (DS1340 RTC). When I try to send
> info to the RTC, system performance slows
> down to a crawl. It appears that it is being
> swamped with interrupts. Also, unable to read
> anything from the RTC. Is it possible that
> improper pullups on SDA and SCL are causing this?
> I'm using 3.3K pullups. Would it be better to 
> just use the internal pullups already part
> of the port circuitry? Bit rate is 100K.
>
> THanks!
> Doug

standard values are 4.7k on SDA and SCL according to the philips 
databook. But 3k3 resistors should work as well.

regards,
Andreas


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