delay_8us.asm

双CPU BOOTLOADER 综合实验,不用烧写工具 将.out文件转换成.hex文件烧写到flash里

;-----------------------------------------------------
;-----------延迟子程序--------------------------------
;-----------------------------------------------------
  .global     _delay_8us,_delay_25us,_delay_50us
               
_delay_8us:

           rpt #193  ;0.2us
           nop       ;193+7=200*0.025us=5us
           rpt #113  ;0.2us
           nop       ;113+7=120*0.025us=3us
           ret       ;0.625us
;总延迟时间 0.2us+5us+0.2us+3us+0.625us+0.8us= 9.825us          
;-----------------------------------------           

_delay_25us:

           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           ret
;总延迟时间  (0.2us+5us)*5+0.625us+0.8us=27.425us
;-----------------------------------------           
_delay_50us:
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           rpt #192 ;0.2us
           nop
           ret
;总延迟时间 (0.2+5us)*10+0.625us+0.8us=53.425us          
;----------------------------------------