Download Build your own MC68HC11 computer trainer by Yerem G.C. PDF

By Yerem G.C.

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32 Yerem: Build Your Own MC68HC11 Computer Trainer 6 Conclusion I hope this was a great learning experience for you. When I built my first computer it was pretty frustrating. Part of the frustration was due to t h e complexity of the computer and part was due to errors in the instructions. I hope that I’ve at least eliminated those two variables for you. Nonetheless, after a lot of struggling I was able to get the computer working and learned a lot in t h e process. I’m sure you will get much use out of your new computer and I know there will be more home-built computers in your future.

4. Set the DDR Access Bit in the Control Register to 0. Program the Data Direction Register. Set the DDR Access Bit in the Control Register to 1. Access the Peripheral I/O Register to read and write the I/O port. This procedure applies for both Port A and Port B. Once you have programmed the Data Direction Register, you probably will want to leave t h e DDR Access Bit set to 1 for the rest of the program. Here is a code snippet which demonstrates how to program the MC6821: clr clr ldaa staa ldaa staa ldaa staa staa ldaa staa ldaa $A001 $A003 #FF $A000 #0F $A002 #04 $A001 $A003 #FF $A000 $A002 Set the DDRA Access Bit to 0.

Part of the frustration was due to t h e complexity of the computer and part was due to errors in the instructions. I hope that I’ve at least eliminated those two variables for you. Nonetheless, after a lot of struggling I was able to get the computer working and learned a lot in t h e process. I’m sure you will get much use out of your new computer and I know there will be more home-built computers in your future. Just think, ten years from now you will look back fondly to this experience. 33 References [1] Ciarcia, Steve and Burt Brown.

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