key.asm

来自「凌阳单片机以SCAM_2000语音格式播放程序的编写方法」· 汇编 代码 · 共 46 行

.include Hardware.inc
.RAM
.var P_DisplayData
.CODE
.PUBLIC  _Key_Get
_Key_Get:
  irq on
  int irq
  r1=0x0000
   [P_IOA_Dir]=r1
  r1=0x0000
   [P_IOA_Attrib]=r1
  r1=0x00ff
  
   [P_IOA_Data]=r1
  
   r1=0x00ff
   [P_IOB_Dir]=r1
  r1=0x00ff
   [P_IOB_Attrib]=r1
  r1=0x0000
   [P_IOB_Data]=r1
  r1=0x0080
   [P_INT_Ctrl]=r1
  r1=[P_IOA_Latch]
   r1=0x0017
   [P_SystemClock]=r1
L_Wait:
  r1=0x0001
  [P_Watchdog_Clear]=r1
  jmp L_Wait
  
  
.public _IRQ3
 _IRQ3:
   PUSH R1,R2 TO[SP] //保护现场
   r1=0x0080
   
   [P_INT_Clear]=r1
   r1=[P_IOA_Latch]
   r1=[P_IOA_Data]
  
   
 //  cmp r1,[P_IOA_Data]