Using a BF527 I'm trying to reduce power. Can't use Sleep mode because Ethernet connection stops. Have reduce SCLK speed and that saves some power but using the PLL_CTL doesn't seem to work. Any suggestions
Are you executing an idle instruction after writing to PLL_CTL?
Starting with ADSP-BF527 silicon revision 0.2, direct access to PLL_CTL has been replaced by SysControl() function.
Please read the HRM for the ADSP-BF54x Vol. 1of2 as ADSP-BF52x HRM hasn't been updated yet.
If your silicon revision is 0.0 or 0.1, than you will find the correct sequence within the init_code examples: Blackfin\ldr\init_code
system.c or system.asm, respectively. Functions are called full_on. They are used to increase frequency but contain comments how to do it the other way.
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