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BF533 can't work at 12MHz CCLK?

Question asked by rockchn on Mar 25, 2010
Latest reply on Mar 29, 2010 by rockchn

My bf533 used a 12MHz crystal, it worked well at CCLK=24M SCLK=12M

but it can't work at  CCLK=SCLK=12M, if I step into the code at the start of the main(), it  shows illegal code

btw, the external memory is SRAM, not SDRAM

who can give me some ideas?