System Wide Clock?

[SOMRU]

Hello everyone, I currently have a design using 7 16F pics each performing time specific tasks.
All pics are running at 20MHz. The question is would it be to any advantage to sync all the processors from a single clock source? If so, does anyone have any recommendations on a clock driver/distributor.

Thanks

SOMRU

[mackrackit]

Have you seen this? Post #3
http://www.picbasic.co.uk/forum/show...=multiple+pics

[SOMRU]

Thanks Dave, I searched the forums but must have used the wrong nomenclature, as usual. THANKS AGAIN
SOMRU

[mackrackit]

Just happened to remember reading it when it was live.

[SOMRU]

Greeting all, been busy.

I have connected a 16f871 clko to a 16f870 clki, all seemed well.
Connected the 870 clko to a 16f818 clki, as per:

Method 2.

Connect OSC2 from the PIC1 with the Crystal, to OSC1 of PIC2 without. PIC2's OSC2 connects to PIC3's OSC1. PIC3's OSC2 connects to PIC4's OSC1... ad infinitum... Disadvantage: If one of the PICs failed, all the PICs down the chain from that PIC will cease operating also.


Results not so good. The 818 is not running, and have two more pics to drive.

O-scope shows a dc offset and diminishing low side, as it goes down the line.

Has anyone any ideas???

Thanks

[Melanie]

Ensure you have HS Oscillator set in Config Fuses of all your PICs - this increases the drive levels and also allows you fan-out to more than one PIC down the line.