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I can't select external XTAL (ADuC7026) - TRY THIS

Set up the PLL/Clock in the start-up file ("Startup.s")in assembly language. I used:

LDR     R0, =MMR_BASE
MOV     R1, #0xAA
STR     R1, [R0,#PLLKEY1_OFFSET]
MOV     R1, #PLLCON_Val
STR     R1, [R0,#PLLCON_OFFSET]
MOV     R1, #0x55
STR     R1, [R0,#PLLKEY2_OFFSET]

This seems to do the trick!

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