Re: problems changing clock multiplier to 4X on the DS80C400

Hallo Koen,

I use identical cristal frequency and program code, with one exception: I
added 1 program line (mov pmr, #10000000b) before your program, it means
before:

";Multiply crystal frequency by 4
mov pmr, #10001000b ; Set for crystal * 4
..."

and it works very well

Ben

----- Original Message -----
From: "Koen Swinters" <[email protected]>
To: <tini-6tN4nzCoH/[email protected]>
Sent: Sunday, May 23, 2004 9:48 AM
Subject: [TINI]problems changing clock multiplier to 4X on the DS80C400


> Hello,
>
> I'm trying to set the clock multiplier on 4x . For this I use the
following
> code:
> ;
> ; Multiply crystal frequency by 4
> ;
> mov pmr, #10001000b ; Set for crystal * 4
> mov pmr, #10011000b ; Enable multiplier
> WaitCrystal:
> mov a, exif ; Wait for multiplier to be ready
> jnb acc.3, WaitCrystal ; Jump if CKRY is low
> mov pmr, #00011000b ; Go to crystal * 4
>
> I've also written a small test program to test the speed of the
> DS80C400.this program just toggles a pin at full speed for a few msec with
> disabled interrupts.
> The axternal cristal frequency is 14.7456MHz.
> Can someone tell my what is going wrong with changing the clock multiplier
> to 4X and how i can solve this.
>
> regards
>
>
>
>
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