标题: 8253、8255 这段单片机代码为什么运行不下去，求大佬解惑 [打印本页]
作者: 168115387    时间: 2020-5-29 23:54
标题: 8253、8255 这段单片机代码为什么运行不下去，求大佬解惑


  2. CODE    SEGMENT PUBLIC 'CODE'
  3.         ASSUME CS:CODE
  4.         ORG 00H

  6. START:

  8. mov dx,26h;8253初始化
  9. mov al,00110000B
  10. out dx,al
  11. mov dx,20H
  12. mov ax,0Ah
  13. out dx,al
  14. XCHG ah,al
  15. out dx,al
  16. L1:
  17. mov dx,18h;8255初始化
  18. mov al,80h
  19. out dx,al
  20. mov al,0ch
  21. mov dx,80h
  22. out dx,al

  24. mov dx,26h;锁存判断是否到时间
  25. mov al,00001111B
  26. out dx,al
  27. mov dx,20h
  28. in al,dx
  29. mov ah,al
  30. in al,dx
  31. xchg ah,al
  32. cmp ax,10h
  33. JNA L1

  35. mov dx,26h;8253初始化
  36. mov al,00110000B
  37. out dx,al
  38. mov dx,20H
  39. mov ax,05h
  40. out dx,al
  41. XCHG ah,al
  42. out dx,al
  43. L2:
  44. mov dx,18h;8255初始化
  45. mov al,80h
  46. out dx,al
  47. mov al,0ah
  48. mov dx,80h
  49. out dx,al

  51. mov dx,26h;锁存判断是否到时间
  52. mov al,00001111B
  53. out dx,al
  54. mov dx,20h
  55. in al,dx
  56. mov ah,al
  57. in al,dx
  58. xchg ah,al
  59. cmp ax,05h
  60. JNA L2

  62. mov dx,26h;8253初始化
  63. mov al,00110000B
  64. out dx,al
  65. mov dx,20H
  66. mov ax,05h
  67. out dx,al
  68. XCHG ah,al
  69. out dx,al
  70. L3:
  71. mov dx,18h;8255初始化
  72. mov al,80h
  73. out dx,al
  74. mov al,21h
  75. mov dx,80h
  76. out dx,al

  78. mov dx,26h;锁存判断是否到时间
  79. mov al,00001111B
  80. out dx,al
  81. mov dx,20h
  82. in al,dx
  83. mov ah,al
  84. in al,dx
  85. xchg ah,al
  86. cmp ax,05h
  87. JNA L3

  89.         ; Write your code here
  90. ENDLESS:
  91.         JMP ENDLESS
  92. CODE    ENDS
  93.         END START
复制代码
这段代码为什么运行不下去，求大佬解惑？？？

作者: 51hei团团    时间: 2020-5-31 15:52
这么老的芯片 估计都已经买不到了啊
作者: apple_01    时间: 2020-5-31 16:27
重复代码没有意思啊，搞个子程序调用嘛



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