OneWire DS1820 works with HS and doesnt work with HSPPL

[smed]

Hi,
I am using a 18FLF2550 with a 8 Mhz crystal in the EasyPIC5 board. Device setting for programmer is PIC18F2550.
Version of PicFLASH is 7.13, mikroC PRO compiler is Version 3.8.

The DS1820 example works fine with the HS oscillator, but does not work with the HS PPL.

For my additional code that stores the temperature values on a MMC its the other way around - works with HSPPL but fails with just HS.

How do I get both to work together? I tried many settings and crystals, but I didn't get any combination where both OneWire and MMC was working.

Thanks
Dietmar

[filip]

Hi,

It can be tricky to set the oscillator for 18F2550 correctly with PLL.

Please, see the following topic for detailed information :
http://www.mikroe.com/forum/viewtopic.php?t=10646

18F2550 and 18F4550 share the same datasheet, so don't be confused.

Also, carefully read the Oscillator section in the datasheet for 18F2550.

Regards,
Filip.