How to configure ATmega16 to run with external crystal osci

[sino]

Hi,

I am an AVR beginner with ATmega16 as the Device. How can an ATmega16 be configured to run with an external crystal oscillator of frequency 7.3728 MHz. Which are the Special Function Registers for this purpose and how they have to be configured? What is the default settings? I am using CodeVisionAVR(2k evaluation) and also IAR Embedded Workbech Kickstart. Kindly help me with example C codes.

with regards
-sino-

 

[nandhu015]

Re: How to configure ATmega16 to run with external crystal o

Hai

Selecting External clock should be done with programmer

if you tell me what programmer are you using, then i can help you

It is done by setting clksel bits in fuse bits

Nandhu

 

[sino]

Re: How to configure ATmega16 to run with external crystal o

Hai,

I am using PonyProg2000 and the burning HW(AVR-PG1B. http//www.olimex.com.dev) was designed as per a free download and is using PC serial port.

With Regards
-sino-

 

[nandhu015]

Re: How to configure ATmega16 to run with external crystal o

Hi

Run PonyPorgrammer, select the device i.e. AVR => mega16

Press Control+s, You will see a screen with some check boxes

there you have to set cksel3 to cksel0

Please read carefully mega 16 datasheet (page25) before setting

CAUTION : SETTING WRONG BITS MAY LEAD TO CHIP DAMAGE

Take caution in settings

Regards
Nandhu

 

[nipun]

Re: How to configure ATmega16 to run with external crystal o

external clock can be set by setting CKSEL3...0 bits.these bits ve to b manually set using programmer and is done in different ways using the programming software u use.but be carefull not to mess with others bits if u dnt know there functions.read data sheet before setting bits

 

[yadegari]

in codewizard template of codevision software set CKSEL fuse bits