Guillermo, As far as I know, with the 9S12A256 things are similar to the case of the 9S12DP26 and 9S12DT256 parts (as the A256 is using the same silicon mask-sets as the 9S12Dx256 parts): The Pierce oscillator is only supported by the newest mask set - 0L91N, which is covered by the following data sheets: http://e-www.motorola.com/files/microcontrollers/doc/data_sheet/9S12DT256DGV3.pdf (See the first page that lists the 9S12A256 as one of the covered parts) The Pierce oscillator is not covered by any of the older A256 mask-sets. Hope this helps, Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 09:52 PM 9/8/03 -0300, you wrote: >Doron, >As I can see, you are an expert in deciphering all the HCS12 derivatives >info, so I want to ask you: >Does the 9212A256 support Pierce Oscilator ? >I've read the device guide and in one place mentions it (XCLKS signal >description) , but in section A.5.2 Oscillator it only appears the colpitts >configuration. >Regards, >Guillermo. > >----- Original Message ----- >From: "Doron Fael" <> >To: <> >Sent: Monday, September 08, 2003 5:08 PM >Subject: [68HC12] Re: HCS12: Pierce Oscillator > > Daniel, > > > > As I wrote before the newest 9S12DG256 mask-set which is 0L91N, does > > support the Pierce crystal configuration, as all the 9S12DG128 parts. > > > > Why can't you switch to use this newest mask set as your super-set part? > > > > Hope this helps, > > Doron > > Nohau Corporation > > HC12 In-Circuit Emulators > > www.nohau.com/emul12pc.html > > > > At 02:08 PM 9/8/03 +0000, you wrote: > > >I just find it strange that for example DG128B supports Pierce, while > > >it's "superset" (or so I thought) DG256B does not. In my application > > >I am therefore forced to use Colpitts only because of compability > > >with DG256. Even though I would prefer to use Pierce because it > > >handles higher frequencies etc. > > >Or maybe I should just take a closer look at those erratas... :) > > > > > >Thanks > > >/Daniel

Doron, As I can see, you are an expert in deciphering all the HCS12 derivatives info, so I want to ask you: Does the 9212A256 support Pierce Oscilator ? I've read the device guide and in one place mentions it (XCLKS signal description) , but in section A.5.2 Oscillator it only appears the colpitts configuration. Regards, Guillermo. ----- Original Message ----- From: "Doron Fael" <> To: <> Sent: Monday, September 08, 2003 5:08 PM Subject: [68HC12] Re: HCS12: Pierce Oscillator > Daniel, > > As I wrote before the newest 9S12DG256 mask-set which is 0L91N, does > support the Pierce crystal configuration, as all the 9S12DG128 parts. > > Why can't you switch to use this newest mask set as your super-set part? > > Hope this helps, > Doron > Nohau Corporation > HC12 In-Circuit Emulators > www.nohau.com/emul12pc.html > > At 02:08 PM 9/8/03 +0000, you wrote: > >I just find it strange that for example DG128B supports Pierce, while > >it's "superset" (or so I thought) DG256B does not. In my application > >I am therefore forced to use Colpitts only because of compability > >with DG256. Even though I would prefer to use Pierce because it > >handles higher frequencies etc. > >Or maybe I should just take a closer look at those erratas... :) > > > >Thanks > >/Daniel > > > > > > > >-------------------- > > > > > > > >">http://docs.yahoo.com/info/terms/ > > -------------------- > > ">http://docs.yahoo.com/info/terms/

Daniel, As I wrote before the newest 9S12DG256 mask-set which is 0L91N, does support the Pierce crystal configuration, as all the 9S12DG128 parts. Why can't you switch to use this newest mask set as your super-set part? Hope this helps, Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 02:08 PM 9/8/03 +0000, you wrote: >I just find it strange that for example DG128B supports Pierce, while >it's "superset" (or so I thought) DG256B does not. In my application >I am therefore forced to use Colpitts only because of compability >with DG256. Even though I would prefer to use Pierce because it >handles higher frequencies etc. >Or maybe I should just take a closer look at those erratas... :) > >Thanks >/Daniel > >-------------------- > >">http://docs.yahoo.com/info/terms/

I just find it strange that for example DG128B supports Pierce, while it's "superset" (or so I thought) DG256B does not. In my application I am therefore forced to use Colpitts only because of compability with DG256. Even though I would prefer to use Pierce because it handles higher frequencies etc. Or maybe I should just take a closer look at those erratas... :) Thanks /Daniel

Daniel, The Motorola documents on the web are usually pretty good in specifying which derivatives and mask sets supports the Pierce crystal configuration and which don't. This information is found in the device user guide for every specific HCS12 derivative. If the pierce configuration is shown in the document, the device supports the Pierce configuration, and if not shown the device doesn't support the Pierce configuration. The device user guide also specifies the part numbers and mask-sets that are covered by the specific document. Please note that for the S12Dx256 parts for example, several device user guides are available, under DP256, DP256B, DT256 etc. These different device user guides specify the relevant device-specific information for the various mask-sets of the S12Dx256 devices. The same applies for other HCS12 devices as well. Hope this helps, Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 10:16 AM 9/8/03 +0000, you wrote: >I contacted Motorola about this: >"The crystal circuitry for the HCS12D-family and the HCS12A-family is >not standard with HCS12 family of components, you could only use a >crystal with a Colpitts configuration or an >external oscillator." >They are going to send me a list of which circuits that don't support >Pierce; I will post it here as soon as I get it. >--- In , Doron Fael <doronf@n...> wrote: > > You need to check which MC9S12DG256 mask set you are using. Most of the > > S12DG256 mask sets (the older ones) don't support the Pierce crystal. Only > > the newest 0L91N mask-set has support for the Pierce oscillator. > > > > The newer 0L91N also has other changes from the previous S12Dx256 > > derivatives. I did not come across a Motorola document that clearly points > > out these differences so I think you will need to study the Motorola > > document carefully to make sure you don't trip over any of these mask-set > > changes. > > > > The document for the newer 0L91N S12Dx256 mask-set is found at: > > > http://e-www.motorola.com/files/microcontrollers/doc/data_sheet/9S12DT256DGV3.pdf > > > > Hope this helps, > > Doron > > Nohau Corporation > > HC12 In-Circuit Emulators > > www.nohau.com/emul12pc.html > > > > At 09:04 AM 9/2/03 +0000, you wrote: > > >I want to use a Pierce Oscillator (with a 20MHz crystal), but it > > >doesn't work for some reason. Does anyone know where I can get more > > >information or schematics on how to do this together with the HCS12? > > > > > >I'm using HCS12DG256 and the Codewarrior compiler.

I contacted Motorola about this: "The crystal circuitry for the HCS12D-family and the HCS12A-family is not standard with HCS12 family of components, you could only use a crystal with a Colpitts configuration or an external oscillator." They are going to send me a list of which circuits that don't support Pierce; I will post it here as soon as I get it. --- In , Doron Fael <doronf@n...> wrote: > You need to check which MC9S12DG256 mask set you are using. Most of the > S12DG256 mask sets (the older ones) don't support the Pierce crystal. Only > the newest 0L91N mask-set has support for the Pierce oscillator. > > The newer 0L91N also has other changes from the previous S12Dx256 > derivatives. I did not come across a Motorola document that clearly points > out these differences so I think you will need to study the Motorola > document carefully to make sure you don't trip over any of these mask-set > changes. > > The document for the newer 0L91N S12Dx256 mask-set is found at: > http://e- www.motorola.com/files/microcontrollers/doc/data_sheet/9S12DT256DGV3.p df > > Hope this helps, > Doron > Nohau Corporation > HC12 In-Circuit Emulators > www.nohau.com/emul12pc.html > > At 09:04 AM 9/2/03 +0000, you wrote: > >I want to use a Pierce Oscillator (with a 20MHz crystal), but it > >doesn't work for some reason. Does anyone know where I can get more > >information or schematics on how to do this together with the HCS12? > > > >I'm using HCS12DG256 and the Codewarrior compiler. >

You need to check which MC9S12DG256 mask set you are using. Most of the S12DG256 mask sets (the older ones) don't support the Pierce crystal. Only the newest 0L91N mask-set has support for the Pierce oscillator. The newer 0L91N also has other changes from the previous S12Dx256 derivatives. I did not come across a Motorola document that clearly points out these differences so I think you will need to study the Motorola document carefully to make sure you don't trip over any of these mask-set changes. The document for the newer 0L91N S12Dx256 mask-set is found at: http://e-www.motorola.com/files/microcontrollers/doc/data_sheet/9S12DT256DGV3.pdf Hope this helps, Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 09:04 AM 9/2/03 +0000, you wrote: >I want to use a Pierce Oscillator (with a 20MHz crystal), but it >doesn't work for some reason. Does anyone know where I can get more >information or schematics on how to do this together with the HCS12? > >I'm using HCS12DG256 and the Codewarrior compiler.

Be carfull I tried using Pierce Method on the 9s12A256 based on the motorola data sheet and could not get it to work spent three days before I sent Motorola a question why it did not work, the reponse I got was data sheet was wrong from the Motorola site the 9s12A256 did not support Pierce Method only colpitts , so I guess before you spend days trying to debug your design make sure your device the HCS12DG256 supports Pierce Method as I know now the DP nor the A version will work with in Pierce ... danne_lundin <> wrote: I want to use a Pierce Oscillator (with a 20MHz crystal), but it doesn't work for some reason. Does anyone know where I can get more information or schematics on how to do this together with the HCS12? I'm using HCS12DG256 and the Codewarrior compiler. -------------------- ---------------------------------