when connecting my atmega8515 to a circuit, can i get it to work without a MHz crystall? I don't have one ;)
Yes, the mega8515 has an internal RC oscillator. As long as you don't need precise timing, it will be fine.
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the atmega8515 has two internal speeds like most (all?) avrs, well I guess it has one, but its
8Mhz (to get this you have to burn the fusebit CKDIV8 to 1 (unprogrammed))
1Mhz(stock when you buy the chip, it comes like this (CKDIV8 0)
basically a 8Mhz internal clock, but there is also a internal clock divider, with CKDIV programmed, it divides the clock by 8, so 1Mhz.
yes, most of i have used without crystals are at 1 MHz
the atmega8515 has two internal speeds like most (all?) avrs
The atmega8515 is one of the older AVRs, it does not have the new clock prescaler, no CKDIV8 fuse. Instead the CKSEL fuses select one of 4 speeds:
Table 12. Internal Calibrated RC Oscillator Operating Modes
CKSEL3..0 Nominal Frequency (MHz)
Note: 1. The device is shipped with this option selected.
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