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The timer flags are cleared by either loading the accumulator with the bits you want cleared and then storing them in the timer flag register, or by using BCLR with a complemented mask. -Dirk "I speak from experience" (28 years ago, 29-Jun-96, to lugnet.robotics.handyboard)
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In regards to the bit manipulations of the timer flags... I concede. At this time I have neither the mental capacity nor the desire to figure out what is correct. After copying the paragraphs earlier, I am only sure that the documents could use some (...) (28 years ago, 29-Jun-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) Lyle, The following provide PLCC-to-breadboard adapters: Amaze Electronics Co. Tel: 1-800-996-2008 Web: www.hooked.net/users/amaze Technological Arts Tel: 1-416-963-8996 Web: www.io.org/~techart You can see their ad on the July 1996 issue of (...) (28 years ago, 29-Jun-96, to lugnet.robotics.handyboard)
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| | Re: your mail
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(...) Very confusing, especially since at the beginning of the same file, there are the lines: * Setup Interrupt for Encoders * LDX #BASE BSET TCTL2,X %00001100 /* Interrupts TIC3,TIC2 rising edge*/ BCLR TFLG1,X %00000010 /* Clear IC3,IC2 Flags */ (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | hb basic questions.
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Well this is my first post and my first look at the handy board. I have a couple of basic questions, sorry if this is maybe asking for the obvious but I didn't find answers to these on the web nor in the archive. Anyway thanks already for all and (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | Easiest way to add two more input and output compares?
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Well, I have ny Handyboard running a little lawnmower around, but I can only feasibly get two PWM signals in for processing and relaying on to the motor drivers. I need two more signals (drive and steering, all I'm doing now is camera pan/tilt) to (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | Re: your mail
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(...) And to add to all the confusion, see page A-15 of the same book, which contradicts what page 10-14 says. I followed he instructions on page 10-14 and it worked. Also remember those odd word-blitz methods of clearing a single bit only seem to (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) I found this entry in the HC11 handbook, page 10-14. It may help.. "The most common way of clearing a status flag bit in the timer flag registers is to load an accumulator with a mask that has a one in the bit(s) corresponding to the flag(s) (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | BCLR TFLG1,X %11111101?
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In the file encoders.asm, there's a section like: Port1_ShaftInt: LDX variable_port1_shaft_count [stuff deleted] BCLR TFLG1,X %11111101 RTI I'm trying to figure out what the BCLR line does. Why does it clear the bits of all the timers _except_ the (...) (28 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) Lyle, The following provide PLCC-to-breadboard adapters: Amaze Electronics Co. Tel: 1-800-996-2008 Web: www.hooked.net/users/amaze Technological Arts Tel: 1-416-963-8996 Web: www.io.org/~techart You can see their ad on the July 1996 issue of (...) (28 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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(...) I agree that the "software" solution in an HC11 is limiting. It is this limitation that I am trying to overcome in hardware. Rather than shift a bit-pattern out for PWM, I would use three of the built-in timers to accomplish the task. One (...) (28 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) Actually an 'HC11 isn't a very efficient PWM controller. However a Microchip PIC is. (or a Motorola 68HC05, or a Siemans 87C752, etc) These single chip microcontrollers are both cost effective and easy to use. In the July (or August) '95 issue (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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My earlier posting has left me thinking.. (Suprise!) A MUCH more efficient way of doing PWM would be to use another 'HC11. The counter-timer circuits are perfect for the job, and the SPI would serve just fine for communications. Of course, this (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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What's Happening?? (Or, trying to spark some interaction) I currently am working on a few hardware projects for the Handy-Board.. As I may have described earlier.. Current projects include 4 boards, each on a PC slightly smaller than the (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | Re: ??
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(...) Ahh, well that's good, and bad. :-) C'mon everyone, what's everybody _doing_ with their handy board? Letting it sit on the desk, beeping and collecting dust? (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | ??
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Just curious if something is wrong, I haven't gotten mail from the list in quite some time. (4 or 5 days) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | 6811 Suppliers
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I just bought a MC68HC11A1FN from BG micro for $7.99 you can find them at (URL) ,,, (o o) ===...===oOO==(_)==OOo===...=== "Its difficult to work in groups when you are omnipotent...." -Q (URL) Mike Downey mdowney@eng.ua.edu (URL) .oooO Oooo. (URL) (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | Re: downloading
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(...) I would say you should check for a short between the E Clock and another trace. Curt Mills, WE7U. hacker@tc.fluke.com archer@eskimo.com we7u@we7u.ampr.org (URL) (28 years ago, 21-Jun-96, to lugnet.robotics.handyboard)
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| | downloading
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I, too, have had problems downloading pcode to the latest handy board I have built. I have replaced every ic with the ic's from a working handy board, and have tested each trace from all 4 of the ic's that were installed (6811, 132, 62256 and the (...) (28 years ago, 21-Jun-96, to lugnet.robotics.handyboard)
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| | handyboard
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hello, i wrote a mail about an hour ago. this message was not really complete. i shall explain the problem. i am a student electrical engineering at the uneversity of twente, the netherlands. we were ordered to design something. we decided to built (...) (28 years ago, 20-Jun-96, to lugnet.robotics.handyboard)
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