Calender IC PCF8563

[Electronics4you]

How can I combine the real time clock/calender IC PCF8563 from Philips with a PIC microcontroller?

 

[Jay.slovak]

How can I combine the real time clock/calender IC PCF8563 from Philips with a PIC microcontroller?

The PCF8563 is a CMOS real time clock/calendar optimized for low power consumption. A programmable clock output, interrupt output and voltage-low detector are also provided. All address and data are transferred serially via a two-line bidirectional I²C-bus. Maximum bus speed is 400 kbit/s. The built-in word address register is incremented automatically after each written or read data byte.

It uses I2C Bus, so connect it to PIC with 2 wires (SDA and SDL). Use Software or Hardware I2C in the PIC to interface the IC. Use commands from Datasheet of PCF8563 to set and retrieve date info.

 

[upand_at_them]

How accurate is that chip? My current project uses a 32k crystal on Timer1 of a 16F628 for a RTC, in addition to the main functions of the program. Accuracy is about 4 seconds per 24 hours.

Mike

 

[Jay.slovak]

How accurate is that chip? My current project uses a 32k crystal on Timer1 of a 16F628 for a RTC, in addition to the main functions of the program. Accuracy is about 4 seconds per 24 hours.

Mike

It should be around 5 Minutes per year (depending on Crystal used, Voltage and Temperature...).

 

[Pommie]

How accurate is that chip? My current project uses a 32k crystal on Timer1 of a 16F628 for a RTC, in addition to the main functions of the program. Accuracy is about 4 seconds per 24 hours.

Mike

Mike,

I did this a couple of years ago and got much better accuracy than that. I used the special events trigger on ccp1 to reset the timer to 32767 I.E. 1 less than the crystal frequency.

I can did the code out if it would help at all.

Mike.

 

[Nigel Goodwin]

One of my PIC tutorials does exactly what you want!.

 

[Roboticinfo]

reply

Your tutorials always come in handy Nigel.

I hope my website will come in handy the way yours does
except mine is only for robotics.

Anyway here is a update of my website
I am working on the hardware for the sercurity robot and will post it as soon as I get a hold on my friends digital camera.
Also my tutorials for my spybot
which is a begniner project for the newbies will becoming
july 5.