if you don't need an accurate clock in the "fast" phase, you could use
DCOCLK at it max values for MCLK. this means that the CPU runs at about
5MHz. this frequency won't be temperature stable and is somewhat lower
than your 8MHz.
If I want system runs in 8MHz, I use a 8MHz crystal at XT2, what's the
difference with your suggestion?
you may be able to use a watch crystal (32768Hz) at XT1. it can be used
for the Timer_A (and maybe Watchdog) module. this way you'd have a
accurate time and still a fast CPU.
Can you explain detail about this way? You mean use a watch crystal at
XT1, CPU will have an accurate time and fast enough?
Thank you very much
regards
Zhengsu
However, if I use on 8 MHz crystal, while di
----- Original Message ----- From: "Chris Liechti" <cliec...@gmx.net>
To: <mspgcc-users@lists.sourceforge.net>
Sent: Friday, December 03, 2004 5:05 PM
Subject: Re: [Mspgcc-users] About system fequency
Gao Zhengsu wrote:
Hi, everybody:
I have a question about system frequency. When I use an 8 MHz crystal
in
XT2, can I change system frequency from 8MHz to 1MHz simply by
divider at run
time without losing anything.
basicaly yes, div 8 is the highest divider you can select in the basic
clock module and you can switch it at runtime.
switching clocks can be tricky in some cases, e.g. if you want to have a
realtime clock running accurately.
it's not the same as connecting a lower frequency crystal. in general
faster clocks use more current. so using a faster crystal than you need
means less battery life.
chris
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