Re: Fujitsu microcontroller (8-Bit) Clock Modes Problems

On 6 Jan., 19:28, Jasen Betts <ja...@xxxxxxxxxx> wrote:
On 2009-01-06, Chris <christophe.ring...@xxxxxxxxx> wrote:



Hi,

I'm programming on a Fujitsu Microcontroller from the MB95Fxxx family
and I'm trying to switch the clock modes. (I'm using the MB95
So I can switch from MAIN-PLL Clock to SUB-PLL Clock without any
problems but I can not switch from SUB-PLL to MAIN-PLL correctly...

I managed to isolate the prob: to switch the clock modes we only have
2 registers (SYCC (0x07) and PLLC (0x06)).
If I read the value back (I copied them into a variable) and compare
them with the values in the memory map, respectively on address 0x06
and 0x07, the values don't correspond !

Code to switch from SUB-PLL to MAIN-PLL Code

PLLC_MPEN = 1;
While (!PLLC_MPRDY); /* the program waits here */

The Symbol PLLC_MPRDY is 0, but the corresponding bit in memory at
address 0x06 is set !
So the program works and switch every 2s in one of both modes. (I
checked if the quartz were oscillating)

Does someone already have this problem ? or have a solution ?

perhaps you are misusing the symbol, maybe it should be used something
like this:

PLLC_MPEN = 1;
while(!(PLLC_MPEN & (1<<PLLC_MPRDY))){ /* wait */};

Hi,

It works ! That was the problem !
Thanks for the answer :-)

bye

Chris
.

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