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  1. ; University of Illinois at Chicago, Dept. of Electrical and Computer Engineering
  2. ; ECE 367 -Microprocessor-Based Design
  3. ; Three Bit Counter
  4. ; Version 2, Aug 27, 2011
  5. ; By Robert A. Becker
  6.  
  7. ; PAY ATTENTION TO THE ALIGNMENT BELOW
  8. ; Labels start in the first column  (left most column = colunm 1)
  9. ; OP CODES are at column 9
  10. ; COMMENTS follow a ";" symbol
  11. ; Blank lines are allowed (Makes the code more readable)
  12.  
  13. ; Define symbolic constants
  14. PortT   EQU $240        ;Define Register Locations
  15. DDRT    EQU $242
  16. INITRG  EQU $11
  17. INITRM  EQU $10
  18. CLKSEL  EQU $39
  19. PLLCTL  EQU $3A
  20. CRGFLG  EQU $37
  21. SYNR    EQU $34
  22. REFDV   EQU $35
  23. COPCTL  EQU $3C
  24. TSCR1   EQU $46
  25. TSCR2   EQU $4D
  26. TIOS    EQU $40
  27. TCNT    EQU $44
  28. PortM EQU $250
  29. DDRM EQU $252
  30. SAVE EQU $60   ;created a variable to save my increment register because delay sub routine changes it.
  31. TENSAVE EQU $5020
  32. TC0 EQU $50
  33. TFLG1   EQU $4E
  34. ;
  35. ; The ORG statment below would normally be followed by variable definitions
  36. ; There are no variables needed for this project.
  37. ; THIS IS THE BEGINNING SETUP CODE
  38. ;
  39.     ORG $3800       ; Beginning of RAM for Variables
  40. ;
  41. ; The main code begins here. Note the START Label
  42. ;
  43.     ORG $4000       ; Beginning of Flash EEPROM
  44. START   LDS #$3FCE      ; Top of the Stack
  45.     SEI         ; Turn Off Interrupts
  46.         MOVB    #$00, INITRG    ; I/O and Control Registers Start at $0000
  47.     MOVB    #$39, INITRM    ; RAM ends at $3FFF
  48. ;
  49. ; We Need To Set Up The PLL So that the E-Clock = 24MHz
  50. ;
  51.     BCLR CLKSEL,$80 ; disengage PLL from system
  52.     BSET PLLCTL,$40 ; turn on PLL
  53.     MOVB #$2,SYNR   ; set PLL multiplier
  54.     MOVB #$0,REFDV  ; set  PLL divider
  55.     NOP     ; No OP
  56.     NOP     ; NO OP
  57. PLP     BRCLR CRGFLG,$08,PLP ; while (!(crg.crgflg.bit.lock==1))
  58.     BSET CLKSEL,$80 ; engage PLL
  59. ;
  60. ;
  61. ;
  62.     CLI     ; Turn ON Interrupts
  63. ;
  64. ; End of  setup code. You will always need the above setup code for every experiment
  65. ;
  66. ;
  67. ;
  68. ;
  69. ;
  70. ;
  71. ;
  72. ;
  73. ;
  74. ;
  75. ;
  76. ;
  77. ;START CODING HERE____________________________________________________
  78.  
  79.     LDAA    #$FF    ; Make PortT Outbound
  80.     STAA    DDRT
  81.   LDAA  #$FB  ; make pm2 inbound  but rest outbound
  82.   STAA  DDRM
  83.  
  84.   LDAA #$3f
  85.   STAA PortT
  86.   LDAA #$03
  87.   STAA PortM
  88.   LDAA #$00
  89.   STAA TENSAVE
  90.   STAA PortM
  91.  
  92.  
  93. THIS:
  94.  
  95.   BRSET SAVE, #$0A, TEN ; Branch to 'TEN' if save variable is incremented all the way to $10
  96.   LDAB  #$00
  97.    
  98. HERE: BRSET PortM, #$04, HERE ; Branch if PM2 is SET (1) to HERE  
  99.  ;
  100.  
  101.  ; JSR  DELAY
  102.  
  103.    JSR DISPLAY
  104.    BRA HERE
  105.    BRA *
  106. ;  LDAB  #$00  ;initialize acc B to 0 to begin count in table
  107. ;  JSR   DISPLAY ;jump to sub routine 'display'
  108. ;THIS:         ;loop branch statement takes you here
  109.   JSR DELAY
  110.  
  111. ;
  112. ; We use some built-in timer functions to create an accurate delay
  113. ;
  114. ;
  115. ;
  116. ;
  117. ;
  118. ;
  119. ;
  120. ;
  121. ;
  122. ;
  123. ;
  124. ;------------------------------------------------
  125. ;GIVEN DELAY SUBROUTINE
  126.  
  127.  
  128. DELAY   PSHA            ; Save accumulator A on the stack
  129.     LDY #03     ; We will repeat this subroutine 3 times
  130.     MOVB    #$90,TSCR1  ; enable TCNT & fast flags clear
  131.     MOVB    #$06,TSCR2  ; configure prescale factor to 64
  132.     MOVB    #$01,TIOS   ; enable OC0
  133.     LDD TCNT        ; Get current TCNT value
  134. AGAIN   ADDD    #37500      ; start an output compare operation
  135.     STD TC0     ; with 100 ms time delay
  136. WAIT    BRCLR   TFLG1,$01,WAIT  ; Wait for TCNT to catch up
  137.     LDD TC0     ; Get the value in TC0
  138.     DBNE    Y,AGAIN     ; 5 X 100ms = 1 sec
  139.     PULA            ; Pull A
  140.     RTS       ;
  141.    
  142. ;___________________________________________________________
  143. ;
  144. ;
  145. ;
  146. ;
  147. ;
  148. ;
  149. ;
  150. ;
  151. ;
  152. ;
  153. ;
  154. ;
  155. ;
  156. ;_____________________________________________________________ 
  157. ;displaylab3
  158. DISPLAY:
  159.  
  160.   LDAA #$00
  161.   STAA PortM, Y
  162.  
  163.   LDAB SAVE
  164.              
  165.   LDX   #TABLE   ;load table into x
  166.   LDAA  B,X      ;load b'th element of table into a
  167.   STAA  PortT,Y  ;display a in port t
  168.   INCB           ;increment b for next run through loop
  169.   LDAA  #$01      ;load bth element of table into a
  170.   STAA  PortM,Y  ;display a in port m
  171. ;  
  172.   STAB  SAVE     ;save b in variable save before delay
  173. ;  
  174.   JSR   DELAY    ;Keep display on for a second with current uin digit
  175.   JSR   DELAY    
  176.  
  177.   LDAB  SAVE     ;transfer variable back into incrementing accumulator
  178.  
  179.  
  180.   BRSET SAVE, #$0A, THIS ; Branch to 'this' if save variable is incremented all the way to $10,
  181.   RTS
  182. ;__________________________________________________________________________
  183.  
  184.  
  185. TEN
  186.   LDAA #$00
  187.   STAA PortM, Y
  188.   LDAB TENSAVE
  189.  
  190.   LDX #TABLE
  191.   LDAA  B, X
  192.   STAA PortT, Y
  193.   INCB
  194.   STAB TENSAVE
  195.   LDAA #$02
  196.   STAA PortM, Y
  197.  
  198.   LDAB #$00
  199.   STAB SAVE
  200.  
  201.   RTS
  202.  
  203.  
  204.  
  205.  
  206.  
  207.  
  208.    
  209. ; End of counter code
  210.  
  211.   ;DISPLAY
  212. ;DISPLAY:  
  213. ;  LDX   #TABLE   ;load table into x
  214. ;  LDAA  B,X      ;load b'th element of table into a
  215. ;  STAA  PortT,Y  ;display a in port t
  216. ;  INCB           ;increment b for next run through loop
  217. ;  LDAA  B,X      ;load bth element of table into a
  218. ;  STAA  PortM,Y  ;display a in port m
  219. ;  
  220. ;  STAB  SAVE     ;save b in variable save before delay
  221. ;  
  222. ;  JSR   DELAY    ;Keep display on for a second with current uin digit
  223. ;  JSR   DELAY    
  224.  
  225. ;  LDAB  SAVE     ;transfer variable back into incrementing accumulator
  226. ;  
  227. ;  LDAA  #$00
  228. ;  STAA  PortT,Y  ;turn display off at the end of the program
  229. ;  STAA  PortM,Y  ;turn port m display off for break between uin units
  230.   ;
  231.   ;STAB  SAVE
  232.  
  233.   ;JSR   DELAY    ;Keep off for half second
  234.  
  235.   ;LDAB  SAVE
  236.  
  237.  ; INCB;           ;increment b again to get to next table entry
  238.  
  239. ;  STAB SAVE
  240.  
  241. ;  BRSET SAVE, #$12, THIS ; Branch to 'this' if save variable is incremented all the way to $12,
  242.  
  243.  ; JSR DISPLAY     ;back to the top of the loop
  244. ;table for uin          
  245.         ORG   $5000      ;memory location of table
  246. TABLE:  DC.B  $06, $5b, $4f, $66, $6d, $7D, $07, $7F, $67, $3f
  247.                   ;define table
  248.  
  249. ; Define Power-On Reset Interrupt Vector
  250.  
  251. ; AGAIN - OP CODES are at column 9
  252.  
  253.         ORG $FFFE ; $FFFE, $FFFF = Power-On Reset Int. Vector Location
  254.         FDB START ; Specify instruction to execute on power up
  255.  
  256. ; End of Interrupt code
  257.      
  258.         END        ; (Optional) End of source code
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