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BASCOM-AVR : XMEGA crystal oscillator can not be turned off : REPLY

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@Per Sorry, the osc register need no CCP, you are right at the point. The clocking system is pretty complicated and has a lot of depencies. Maybe the PLL or DFLL also locks the bit. Or it is simple an errata (not all erratas are published...) I would investigate, why the bit is turned ON after reset. This shouldn't happend. @Mark Indeed, a simple [code:1:b2c93b5222]Cpu_ccp = 216 'Config Change Protection Clk_ctrl = 1 'Use Int 32 MHz Osc [/code:1:b2c93b5222] could be done in basic, but a [code:1:b2c93b5222]Cpu_ccp = 216 'Config Change Protection Clk_ctrl.1 = 1 'Use Int 32 MHz Osc [/code:1:b2c93b5222] is compiled to the sequence [code:1:b2c93b5222]ldi r23,&HD8 out CPU_CCP,r23 lds r23,CLK_CTRL ori r23,&H01 sts CLK_CTRL,r23 [/code:1:b2c93b5222] which give us 5 clock cycles for writing to CLK_CTRL after CCP. This will probaly fail. Thats why I use assembler for those kind of timed register access.

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