avr fuse bit doubt????

[Elimathew]

hey guys im using atmega 168A -pu im beginner with avr i have some basic doubts as to can i use 20mhz crystal and if so ive done the fuse settings can you please tell me if its right spien-programmed(logic 0) brownout programmed to 4.3V BODLEVEL1=programmed(logic 0) BODLEVEL0=programmed(logic 0) BOOTSZ1=programmed(logic 0) BOOTSZ0= programmed(logic 0) programmed CKSEL3 rest all are unprogrammed
lowerfuse byte =0xF7
higher fuse byte=0xDC
guys ive used engbedded fuse bit calculator i just needed to be confirmed that my settings are right

 

[ismbn]

Re: av fuse bit doubt????

Lower fuse = 0xCE;
Higher fuse =0xC9;

In this it

CKSEL0=1
CKSEL1=1
CKSEL2=1
CKSEL3=1

SUT0 = 1
SUT1 = 0

CKOPT =0

this setting is for
using external ceramic resonator.
frq. range is 1MHz and above full R/R swing in clk option
startup time = 0 ms additional delay after reset
Oscillator option= full R/R Swing

Do this i have tried this not on 20MHz but on 16MHz...

Ismail...

 

[Elimathew]

thanks ismail for the reply but i needed my fuse bit to be confirmed

 

[alexan_e]

Your setting is

Ext. Full-swing Crystal; Start-up time PWRDWN/RESET: 16K CK/14 CK + 65 ms
Brown-out detection at VCC=4.3 V

seems fine and will work with 20MHz crystal

 

[Elimathew]

thanks alex for the reply

 

[prafful]

hi..

are you using this??

https://www.engbedded.com/fusecalc/

its a best one available on internet..

as per mr. alexan said u can read your setting on engbedded too...

 

[alexan_e]

I think the OP was already using that

guys ive used engbedded fuse bit calculator i just needed to be confirmed that my settings are right

I have used AVRstudio AVRISP interface to check the settings from the high/low data.

 

[ismbn]

thanks ismail for the reply but i needed my fuse bit to be confirmed

Your settings for the fuse bit will definitely Work for 20 MHz
Just go for it......


ISMAIL