[time-nuts] 8051 with RTC

[Jim Stephens]

On 2/28/2012 1:09 PM, SAIDJACK at aol.com wrote:
> Hello troops,
>
> been looking for a modern 8051 with low power standby (<<0.5mA) and  an
> internal RTC (hardware RTC).
>
> Does anyone have any ideas?
>
> Yes, I know there are other parts (PIC, AVR, ARM, etc etc etc), but I would
>   like to stay with the 8051. Also would really like to prevent an external
> I2C or  SPI RTC if at all possible.
>
> Thanks,
> Said
The I2C approach or external spi allows you to just power the RTC part 
for low power.

I did an STC I2C part for linux, was not much fuss at all.  It would not 
be hard to use the linux driver code if you are using c, or if you are 
not, it is still simple enough to do in assembler code.

Jim