AVR-Chat

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