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

By Yerem G.C.

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MC68HC11A8/D). , 1991. [5] Motorola Inc. MC6821 Peripheral Interface Adapter Data Sheet (Lit. No. MC6821/D). , 1985. [6] Motorola Inc. M68HC11EVB Evaluation Board User’s Manual (Lit. No. M68HC11EVB/D1). , 1986. [7] Olney, Bruce L. ” Circuit Cellar INK 44 (1994): 22-29. [8] Swiger, Frank and Joe Glover. ” Circuit Cellar INK 24 (1991): 52-59. 34 Yerem: Build Your Own MC68HC11 Computer Trainer Appendix 1 - Master Parts List This is the master parts list for the prototype computer that was built. The quantity, manufacturer, manufacturer part number and general description is shown.

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. Set the DDRB Access Bit to 0. Set all bits on Port A to output. Set upper bits of Port B to input and lower bits to output. Set the DDRA Access Bit to 1. Set the DDRB Access Bit to 1. Turn on all of the bits on Port A. Read Port B. Check the MC6821 data sheet to find out how to use its more advanced features.

3] Greenfield, Joseph D. The 68HC11 Microcontroller. Orlando, FL: Saunders College Publishing, 1992. [4] Motorola Inc. MC68HC11A8 Technical Data Book (Lit. No. MC68HC11A8/D). , 1991. [5] Motorola Inc. MC6821 Peripheral Interface Adapter Data Sheet (Lit. No. MC6821/D). , 1985. [6] Motorola Inc. M68HC11EVB Evaluation Board User’s Manual (Lit. No. M68HC11EVB/D1). , 1986. [7] Olney, Bruce L. ” Circuit Cellar INK 44 (1994): 22-29. [8] Swiger, Frank and Joe Glover. ” Circuit Cellar INK 24 (1991): 52-59.

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