MC9S12DG256B vs. MC9S12DG256 | 68HC12

We designed a board using the mc9s12dg256b chip before we found out that it had quirks in the type of clock it would accept. We have now populated the same board with the mc9s12dg256 chip, which is the newer version and will accept a standard clock design (Pierce?). The problem is that we cannot program it. Are there any new header files or BDM program updates that we need for Metrowerks Codewarrior to program this? Thank, Jeff

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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 I can see that could cause this. I guess I would start from the beginning. Are you sure that you are getting a clock? Check the ECLK signal to see if it is toggling. Have you configured the XFC filter for the frequency that you want? Use the formula from http://www.freescale.com/files/microcontrollers/software_tools/initializ ation/boot_code_generation/HCS12PLLCALSW.zip to find the correct R and C's. Do you know if you are even talking to the MCU with the BDM? See if you can modify any memory with the BDM. Let me know what you find. Regards, John Honnold Freescale Semiconductor Technical Information Center MCU 16/32 Bit Applications Engineer ---------------------------------------------------------- This email has been classified: (x) Freescale General Business ( ) Freescale Confidential Proprietary ( ) Freescale Internal Use Only ( ) Public -----Original Message----- From: 68HC12@68HC... [mailto:68HC12@68HC...] On Behalf Of griglack Sent: Friday, January 20, 2006 8:41 AM To: 68HC12@68HC... Subject: [68HC12] MC9S12DG256B vs. MC9S12DG256 We designed a board using the mc9s12dg256b chip before we found out that it had quirks in the type of clock it would accept. We have now populated the same board with the mc9s12dg256 chip, which is the newer version and will accept a standard clock design (Pierce?). The problem is that we cannot program it. Are there any new header files or BDM program updates that we need for Metrowerks Codewarrior to program this? Thank, Jeff SPONSORED LINKS Freescale semiconductor inc <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Free scale+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8 051+microprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q> Microcontrollers <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semic onductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+micropr ocessor&c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g> Pic microcontrollers <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+s emiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+mic roprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw> 8051 microprocessor <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+se miconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+micr oprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A> ________________________________ > . ________________________________ [Non-text portions of this message have been removed]

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Discussion Groups | 68HC12 | MC9S12DG256B vs. MC9S12DG256

MC9S12DG256B vs. MC9S12DG256 - griglack - Jan 20 11:41:00 2006

RE: MC9S12DG256B vs. MC9S12DG256 - Honnold John-r37277 - Jan 20 15:26:00 2006