$50 robot UART - Fuse Bits & Lock Bits

[pomprocker]

how do you do the fuse part on this page

http://www.societyofrobots.com/microcontroller_uart_50_robot.shtml

With the serial Olimex AVR STK dongle programmer?

Edit: Oh yeah - I am using the Atmega8

[pomprocker]

To do this in PonyProg:

You would  go the menu and navigate to Command -> Security and Configuration Bits

To Change your fuse bits to 8mhz 6 ck / 14 ck +65ms

You set the CKSEL bits to 0100.

Unchecked equals unprogrammed (bit = 1)
Checked equals programmed (bit = 0)

CKSEL3 = 0
CKSEL2 = 1
CKSEL1 = 0
CKSEL0 = 0

and SUT is set to 10

SUT1 = 1
SUT0 = 0

and you have to make sure that CKOPT is unchecked (1)


I am pretty sure you can't do 8mhz on an Atmega8 without an external crystal.


EDIT: Someone told me the Internal RC oscillator on the atmega8 CAN do 8mhz

[benji]

man,, read the datasheet

calibrated internal oscilator at 8 mhz   

CKSEL3-0 == 0100

WITH CKOPT UN-PROGRAMMED (MEANS == 1)

[pomprocker]

Yes, I did read the datasheet. But in Admins tutorial there was a "divide by 8" bit that he unchecked. I did not see that option on the ATmega8. It must be an ATmega168 option.

[benji]

must be somthin wrong, i did have the atmega8 data sheet and in the calibrated internal osc part it says
1 MHZ(default)
2 MHZ
4 MHZ
8 MHZ

check the fuses as i told u and ull see