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Can't option byte programming

Question asked by nikolay.matyushov on Aug 6, 2013
Latest reply on Sep 5, 2013 by John Flood
Hello!
I'm can't programming option byte in the stm8s105c6t6 into my board stm8s-discovery.
This code:
 mov FLASH_DUKR,#$56;
 mov FLASH_DUKR,#$AE;
 ld A,#%00001100; IWDG_HW and LSI_ EN set
 ldw X,#$4805
 ld (X),A
 incw X
 cpl A
 ld (X),A
 Here I read option bytes,  they unchanged. Can you Help me? 

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