avr fuse bit doubt????

Status
Not open for further replies.
E

Elimathew

Member level 5
Joined
Jun 21, 2011
Messages
88
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,288
Location
India
Activity points
1,894
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
 

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...
 

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

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
 

I think the OP was already using that

Elimathew said:
guys ive used engbedded fuse bit calculator i just needed to be confirmed that my settings are right
Click to expand...

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

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…