RTC module - Easypic5

[malc-c]

Working out the pin mapping for a project and my lack of experience has lead me to another question.

I've purchased one of the RTC2 modules for use with the EasyPIC5 board and I'm stumped on the ideal port to use with the target PIC which is an 18F4550.

The documentation on the module suggests that it uses RC3 (SCL) and RC4 (SDA), however the datasheet on the 18F4550 states that RC3 is not implemented (why it don't say). I'm therefore assuming that I can't use the RTC module with this PIC ?

[rmteo]

The PIC18F4550 has Vusb on pin 18 - where SCL is located for most (if not all non USB) PIC18's. To get the RTC2 to work with the 4550, you will need to use PORTB with RB1 (SCL) and RB0 (SDA).

Probably easiest to use PORTC of something like a PIC18F4620. Or better yet, look into a PIC18F4xJ11 with a built-in RTCC.
See here http://www.picbasic.co.uk/forum/showthread.php?t=12553

[malc-c]

Thanks for the suggestions

[mackrackit]

What is a RTC2 ?

[Bruce]

Dave,

Here's a link to the RTC2: http://www.mikroe.com/en/tools/rtc2-proto/

Malc-c,

You can use this with pretty much any pin that I2CWrite/I2CRead work on, and
you can probably find several PBP examples here for working with the DS1307.

[mackrackit]

Thanks Bruce,
I was going to suggest what you did but though maybe it was something special.
Just a regular RTC...

I use the 1337 on a 4550 with pins PORTD.0 and PORTD.1.
For whatever it is worth....

[ardhuru]

You can use this with pretty much any pin that I2CWrite/I2CRead work on, and
you can probably find several PBP examples here for working with the DS1307.

True, especially since you're using a complete module. If you were using a plain RTC chip, I'd suggest choosing 2 pins which are weak pull-up capable, the'd save you 2 external resistors on the signal lines.

Regards,

Anand