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Hi, in manual there is written following about CANTCL1 register bits (ch. 8.8.2 of 5680x User's manual): "These bits are read/write at any time when SFTRES = 1, except CANE. It is write once in normal modes and any time in special modes when SFTRES = 1." But even thou I set SFTRES I can't clear (or set) it after first write to CANE even thou I set SFTRES = 1. So is it in reality so that CANE is writable only once? Jan PS: here are dumps... dspd$ dd 0xd80 +0x8 Data memory: 0D80: 0010 0085 0049 0013 0000 0000 0007 0000 dspd$ md 0xd80 +0x1 Data memory: Current data: 0D80: 0010 Written data: 0D80: 0001 dspd$ dd 0xd80 +0x8 Data memory: 0D80: 0001 0085 0049 0013 0000 0000 0007 0000 dspd$ md 0xd81 +0x5 Data memory: Current data: 0D81: 0085 Written data: 0D81: 0005 dspd$ dd 0xd80 +0x8 Data memory: 0D80: 0001 0085 0049 0013 0000 0000 0007 0000 dspd$ md 0xd81 +0x0 Data memory: Current data: 0D81: 0085 Written data: 0D81: 0000 dspd$ dd 0xd80 +0x8 Data memory: 0D80: 0001 0080 0049 0013 0000 0000 0007 0000 |
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Writing MSCAN CANE bit (56805)
Started by ●July 12, 2003
Reply by ●July 14, 20032003-07-14
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Ok! That is what I thought, but what I couldn't understand from the
manual clearly. So why are those 'special modes mentioned at all? If they are not supposed to be used? Ok I know that many-times this occurs in manuals. Thanks for all responses! Jan On Mon, Jul 14, 2003 at 09:09:16AM -0400, John Breitenbach wrote: > Jan, > > in manual there is written following about CANTCL1 register bits > (ch. 8.8.2 of 5680x User's manual): > > "These bits are read/write at any time when SFTRES = 1, except CANE. > It is write once in normal modes and any time in special modes when > SFTRES = 1." > > This sentence might have been a little clearer if it was written as three sentences: > > "CANE is write once in normal modes when SFTRES=1. It may be written at any time in special modes when SFTRES=1. The special modes are undocumented and the user can/should not ever be running in special mode". > > At least that's the way that I read it, and that's the way the bit seems to function in my code and in yours. Hope that helps. > > Best regards, > > - John Breitenbach > - Atlantex Corp. > - (201) 664-3445 > - > > "Quote me as saying I was misquoted" - Groucho Marx |
