16F87 Clock

psf · Post by **psf** » Mon Jul 16, 2007 10:41 am

Hi, I selected 4000000 as clock speed but when I programmed it (no PPP) and selected INTRC I/0 the Pic not worked correctly.
So I selected INTRC CLOUT and I mesured 7,8 KhZ (Fosc/4) as reported in data sheet. So I selected with an asm code the OSCCON as 0x66 in order to obtain a 4Mhz clock. Flowcode shouldn't do it for me? Anyway the clockout doesn't work and I don't know the clock frequency!.
What should I do simply to obtain 4Mhz clock using internally rc oscillator? Thanks

Post by **Steve** » Mon Jul 16, 2007 1:23 pm

Try config words as follows:

Code: Select all

config1 (0x2007) = 0x2F39
config2 (0x2008) = 0x3FFF

In your program, you will need to set OSCCON to 0x60.