I need to unprogram the RCEN fusein order to use the external clock- how do i do it?
i use asmpack 1.3 and studio to program the chip.
You need to be using a 'parallel' programmer. The fuse bits are not accessable using serial programming methods. The parallel programmer I use has it's own application, and a seperate drop down menu to allow fuse bits to be set/reset.
Hey Shaun, I think you're wrong. Page 41 of the datasheet for the 2343 gives the low voltage serial command to set/reset the RCEN bit. No need for parallel progarmming.
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Chris is right. Fuses are generally accessible through low-voltage programming, but a few aren't... An obvious example is the SPIEN fuse, which enabled/disables the SPI interface used to do low-voltage serial programming :) Programming of the fuse bits is generally well documented in the datasheets for the respective parts. It's a good thing to be very sure of what you're doing before you set the RSTDSBL fuse available on some devices too, because RESET is needed for in-system programming.
Have I clarified, or just confused you more? Hope the former.
Morten, AVR tech. support, Atmel FAE
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