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Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
Search Results for "xfc"
HCS12D PLL Woes [4 Articles]
Jonathan Masters - Jan 17 2008
Hi all,
I am just upgrading a product and will for only the second time use the
PLL. In the first instance, the clock was only multiplied up from 8MHz
to 12.5MHz and I haven... 
Re: Bad flash? [2 Articles]
dleatmot - Oct 24 2007
--- In 6...@yahoogroups.com, Donald E Haselwood
wrote:
>
> Does the following indicate the flash is bad (or is it something
else)?
>
> Part: MC9S12E128CPV Mask 2L15... Re: S12D/E pad layout [2 Articles]
dleatmot - Jul 19 2007
Hi James,
That layout in the datasheet is a "best practice" layout. Trying
to make the best of all worlds (ATD, Crystal, PLL, etc.)and fit it
all onto a single layer. I ag... Re: Flash sector erase on S12DP256B [5 Articles]
Steve Russell - Oct 26 2006
Adrian,
Some notes on further straws below.
My reading of all this is that the units did not fail in the middle of
operation, but failed only on power up.
Is this correc... Re: PLL - how to tie signals if not used [3 Articles]
Doron Fael - Feb 5 2006
Robert,
The official Freescale recommendation is to connect the Xfc pin to VDDPLL
if the internal PLL is not used.
Hope this helps,
Doron
Nohau
HC12 In-Circuit Emulators
www.... RE: MC9S12DG256B vs. MC9S12DG256
Honnold John-r37277 - Jan 20 2006
Jeff:
The header files for the 'B' version and non 'B' versions is the
same, so this should not be your issue. I double checked the errata,
but nothing stands out that ... MC9S12DP512 oscillator questions [3 Articles]
Kent Williams - Mar 23 2005
Hi,
I'm designing a board for a uni project using the MC9S12DP512 part.
Everything is coming along well, except I've got a few questions about
the oscillator s... Re: HCS12 prototype
Peter Lissenburg - Feb 1 2005
I think the docs are very short on sample/example circuits.
The Vdd1/Vdd2 pins should be connected to caps, it is possible to drive the
core with 2.5v applied to t... Strange clock problem [8 Articles]
Charles E. Scharlau - Aug 11 2004
I'm using an M9S12A64 microprocessor with a Pierce crystal clock
circuit running at 4 MHz. I can see a beautiful, clean, stable, 4 MHz
clock signal on the EXTAL and... Re: Why I can't use the PLL in MC9S12DP256B in Normal Single-Chip Mode
Doron Fael - Jul 22 2004
There is a problem that the LOCK bit sometimes reports that the PLL is
locked and can be selected, where in fact it is not yet locked. (in other
words the lock... Re: speed
Doron Fael - Jul 7 2004
You can increase the internal bus speed by programming the PLL registers
(SYNR and REFDV registers) and engaging the PLL (in the CLKSEL register).
The maximu... Re: Re: new BDM multilink [2 Articles]
Steve Russell - May 13 2004
At 05:17 PM 5/13/2004, Bill T. wrote:
>My board is pretty dense, and I don't have enough space to literally
>reproduce Motorola's "recommended" layout, although... Re: How much clock variance can BDM's tolerate?
Steve Russell - May 12 2004
At 04:43 PM 5/12/2004, Bill T. wrote:
>I'm working on a 9s12 project that requires an accurate 115200 baud
>SCI. I want to run the 9s12 PLL at 22.1182 mHz, which gi... Any issues with driving 9s12's with an oscillator? [2 Articles]
tonalbuilder2002 - May 9 2004
Problems here with my first 9S12 board, was wondering if this sounds
familiar to anybody...
I have a new MC9S12DJ64CPV design that I'm driving with an 8mHz, 5 ... Stuck in "Self Clock Mode"
cleancontrollers - Apr 4 2004
Code ran fine on 68hc9sC32 eval board. In fact the PLL init code I'm
using was lifted from the eval kit.
After changing register include file, REFDV and SYNR I l... Re: Clock oscillator question [2 Articles]
Oliver Betz - Mar 25 2004
Doron Fael <> wrote:
[...]
> Then, after all the above discussion, I believe it would be easier for
> you to use a lower frequency crystal or clock generato... Re: About m68evb912c32 evaluation board [2 Articles]
zeta_alpha2002 - Jan 14 2004
For experiment, change the crystal to 8 MHz to see if it is better.
--- In , "Zámbó Béla" Re: hc912D60 clock 1/2 Xtal? [2 Articles]
Doron Fael - Dec 21 2003
Hello Wade,
First of all you need to have VDDPLL connected to 5V, to allow the PLL to
be engaged. You also need a network of two capacitors and a resistor to be... Re: SCI baud rate.
Gordon Doughman - Oct 20 2003
With your 16 MHz crystal, & an 8 MHz bus speed, you can use the on-chip
PLL to increase the bus speed to 24 MHz where you can obtain a baud rate
of 115200. A valu... Re: Trap on Unimplemented ISR [2 Articles]
Doron Fael - Oct 12 2003
Theo,
The PLL Loop Filter is the name of a network of 2 capacitors and one
resistors that should be connected to the Xfc pin of your HC12 / HCS12, if
you wan... RE: BIG Question: Crystal Clock Generation on 9S12DP256
Dunnett Mark-R60287 - May 7 2003
Hello Group,
As a Motorola FAE I have seen the question about using an external clock on S12 devices a number of times. I checked with my colleagues at TSPG Applic... Re: Problem of reset with 9S12DG256
Steve Russell - Feb 28 2003
About the PLL:
It's easy to program, but there are a some obscure points:
PLL Filter
----------
You MUST put 2 capacitors and a resistor on the XFC pin... RE: D60A clock issue (is it a Timer or PLL problem ?)
K.P.Venu - Nov 14 2002
Darci,
The "slow problem" was present from Power ON itself.
I'm not writing any thing to PLLCR, it's in the RESET
state with PLLON bit set. (VDDPLL is high on pow... Re: XFC filter question [5 Articles]
Michael J Huslig - Nov 12 2002
Gordon,
What then is the function of Tbus mentioned in several spots in the lit when
calculating FCLKDIV and ECLKDIV.
Mike
----- Original Message -----... Pierce Oscillator Configuration [6 Articles]
Adrian Vos - Nov 11 2002
Hi All,
I have just received a PCB back that I designed to use the S12DP256. I am
putting the first unit togeather currently and having some problems getting
a... XFC Loopfilter C and R values [3 Articles]
Adrian Vos - Nov 8 2002
Hi All,
Is anyone able to help me out with the setting of the Capacitor/resistor
values for the PLL loop filter (going to the XFC pin) on the S12DP256.
I am... New to S12DP256 [2 Articles]
Adrian Vos - Oct 28 2002
Hi All,
I am doing a new project using the S12DP256 for the first time. I have used various other Motorola Micros in the past, but I am having trouble finding basi... MC912D60A question [5 Articles]
Alar Lepp - Jul 26 2002
Hi all!
Has anybody experience with such a strange behaviour of MC912D60ACPV8, mask
2K38K:
I have two identical boards with D60A (single-chip mode). Both are a... Three component PLL network useless? [8 Articles]
Oliver Betz - Jul 13 2002
Hi All,
anybody out there with some knowledge of the D60(A) PLL behaviour?
I think the three component (R+C)||C network is not better than a
single capacit... RE: [Mot-68hc12-list] RE: BDM mode and ccts, flash volta ges, AD questions [3 Articles]
Kellogg Dave - Jun 12 2002
I have been getting this message every couple of hours for a couple of days now. Is anyone else suffering the same?
D...@RaymondCorp.com 6... BDM mode and ccts, flash voltages, AD questions [3 Articles]
Lewis, Bob - Jun 10 2002
Hi
Our MCU is the M68dg9128a eval brd, and works as long as the BDM cable is
plugged in (the code is fully rom'd); how do we set this up to run without
the bdm... Re: Reset delay [3 Articles]
William M. Derby Jr. - Jun 7 2002
Hi All,
Is there any problems with the A4 in this regard. I have 5 boards and one
will not
reset out of a power up but will if the reset button is pushed. The ... Re: Errata list for 812A
Zámbó Béla - Jun 6 2002
Yes, I have.
Best regards
Béla Zámbó
MOTOROLA MICROCONTROLLER DIVISION
CUSTOMER ERRATA AND INFORMATION SHEET
Part: HC812AV4.00K51E
Rep...