AVR-Chat

I don't know much about your specific case, and you don't say quite enough, 
but if:

0x80;  // enable the Clock Prescaler Change Enable bit
and
0x02;  // system clock divide by 4

Maybe you want:
CLKPR=0x82

Cat

----Original Message Follows----
From: "Richard Cooke" <rcooke@digitalwavelength.com>
Reply-To: AVR-Chat@yahoogroups.com
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] How do you change the clk speed?
Date: Tue, 21 Nov 2006 05:23:08 -0000

Hi Folks,

I'm working on the ATtiny13 with the AVR Dragon and the latest version
of AVR Studio (4.12 SP4).  I guess I don't understand how to change
the clock frequency correctly.  I read the manual and I thought that
if I used:

CLKPR=0x80;  // enable the Clock Prescaler Change Enable bit
CLKPR=0x02;  // system clock divide by 4

Isn't this the proper way to change the clock?  I'm measuring the
current and I see no change.  I'm running the chip at 5V and according
the the spec sheet I should measure a little over 1ma at 1.2MHz.

Any ideas?

Thanks,

Richard Cooke





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