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Discussion Groups | 68HC12 | Normal flag clearing not working when TFFCA is set (D60A)?
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
Normal flag clearing not working when TFFCA is set (D60A)? - Oliver Betz - Mar 31 13:16:00 2004
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Hello All, using a timer output compare interrupt, I tried to reset the corresponding bit in TFLG1 by writing a '1' to it. This didn't seem to work - only the "fast clear" mechanism worked (writing TCx). Is this: - my error (wrong observation), - by design (and documentation error), - a D60A error? Would be nice if anybody could confirm this. Oliver -- Oliver Betz, Muenchen |
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Re: Normal flag clearing not working when TFFCA is set (D60A)? - Gordon Doughman - Mar 31 14:39:00 2004
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Oliver, With the TFFCA bit set, the normal flag clearing mechanism does not work. Regards, Gordon =============================================================== Gordon Doughman Ph: 937-438-6811 Motorola Semiconductor Fax: 937-434-7457 Field Applications Engineer Pager: 800-759-8352 Pin: 1304089 Suite 175 3131 Newmark Drive Miamisburg, OH 45342 Check out my HC12 book at: http://www.rtcbooks.com/programming.php Oliver Betz wrote: >Hello All, > >using a timer output compare interrupt, I tried to reset the >corresponding bit in TFLG1 by writing a '1' to it. > >This didn't seem to work - only the "fast clear" mechanism worked >(writing TCx). > >Is this: > >- my error (wrong observation), >- by design (and documentation error), >- a D60A error? > >Would be nice if anybody could confirm this. > >Oliver |
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Re: Normal flag clearing not working when TFFCA is set (D60A)? - Oliver Betz - Apr 1 1:48:00 2004
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Gordon Doughman <> wrote: > With the TFFCA bit set, the normal flag clearing mechanism does not > work. Thanks for the confirmation, Gordon. Reading again "MC68HC912D60A — Rev 3.0" I find that this behaviour is not documented. Do you think it's useful I file a service request, or do you have better communication channels? Oliver -- Oliver Betz, Muenchen |
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Re: Normal flag clearing not working when TFFCA is set (D60A)? - Gordon Doughman - Apr 1 9:18:00 2004
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Oliver, Your best bet is to file a service request. Regards, Gordon =============================================================== Gordon Doughman Ph: 937-438-6811 Motorola Semiconductor Fax: 937-434-7457 Field Applications Engineer Pager: 800-759-8352 Pin: 1304089 Suite 175 3131 Newmark Drive Miamisburg, OH 45342 Check out my HC12 book at: http://www.rtcbooks.com/programming.php Oliver Betz wrote: >Gordon Doughman <> wrote: >>With the TFFCA bit set, the normal flag clearing mechanism does not >>work. >> > >Thanks for the confirmation, Gordon. > >Reading again "MC68HC912D60A — Rev 3.0" I find that this behaviour is >not documented. Do you think it's useful I file a service request, or >do you have better communication channels? > >Oliver |
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