I should plan a lot of time to realize an ASM code for PIC 16F84 realizing a ''simple''
Clock calendar with LED display (6) HH:MM:SS or GG:MM:AA with some alarms
every 30 minutes. My question is:
I have to look in the  DS1202 external I2C clock calendar every how many millisecond and
when? And if I ask the DS1202 ( or PCF 8583 ) during a changing of second, how can I prevent the problem? Is better to use a 50hz clock to sincronize the look in the DS 1202?
Someone can help me with a flow of the program?
Thanks in advance.
Bonassin@tin.it