SH-3 Internal Clock Frequency

Hello,

I'm trying to find out the internal clock frequency of a calculator with a SH-3 inside.

The crystal frequency is 14.7 MHz and PLL1 and divider1 are both set to x1 but the
multiplication ratio of PLL2 is unknown.

     MOV.L  #100000000,R0
L00: NOP
     DT     R0
     BF     L00
     RTS
     NOP

The execution of the test code above takes about 17 seconds. Is the internal
clock 14.7 MHz (PLL2 x1) or 29.4 MHz (PLL2 x2)? Thanks.

PLL2 should be defined by the input pins MD0, MD1 and MD2. Just measure the signal levels of those to see what PLL2 does.

Thanks for your reply, but the location of the MD pins is the problem.
Some pictures: http://picasaweb.google.com/naranjo.manuel/CASIO9860

Considering the speed of the test loop, I assume a multiplication ratio of x2, but I'm not really sure.

Sorry, after I posted this reply I saw that this device could have a BGA package. I agree that this makes it a little difficult to check the pins.

You are right, with an execution time of 17 seconds your processor should be running at 29.4MHz = PLL2x2

Thanks for verification.