;通过P1口控制8路LED的四种闪烁模式,单独LED灯左移,单独LED灯右移,相邻两个灯左移,相邻两个灯右移
;通过一个外部中断0来检测按键的跳变沿来切换闪烁模式,第一次按键按下弹起,灯的闪烁状态由单独LED灯左移变为单独LED灯右移,再按下按键,灯的闪烁状态由单独LED灯右移变为邻两个灯左移,依次循环4种闪烁模式。
ORG 0000H
LJMP MAIN
ORG 0003H
LJMP RESET
ORG 0100H
MOV SP,#60H
;================================================================================================================= ;=================================================================================================================
MAIN:
SETB IT0
SETB EX0
SETB EA
START:
MOV R0,#
MOV R2,# MOOD0: CJNE R0,#,MOOD1
MOV R2,#
MOV A,#0FEH
LOOP0:
MOV P1,A
LCALL DELAY500MS
RL A
DJNZ R2,LOOP0
LJMP MOOD0 MOOD1: CJNE R0,#,MOOD2
MOV R2,#
MOV A,#0FEH
LOOP1:
MOV P1,A
LCALL DELAY500MS
RR A
DJNZ R2,LOOP1
LJMP MOOD1 MOOD2: CJNE R0,#,MOOD3
MOV R2,#
MOV A,#0FCH
LOOP2:
MOV P1,A
LCALL DELAY500MS
RL A
RL A
DJNZ R2,LOOP2
LJMP MOOD2 MOOD3: CJNE R0,#,START
MOV R2,#
MOV A,#0FCH LOOP3:
MOV P1,A
LCALL DELAY500MS
RR A
RR A
DJNZ R2,LOOP3
LJMP MOOD3
RESET:
INC R0
RETURN:RETI DELAY500MS: ;误差 -0.000000000127us
MOV R7,#7AH
DL1:
MOV R6,#0DEH
DL0:
MOV R5,#07H
DJNZ R5,$
DJNZ R6,DL0
DJNZ R7,DL1
NOP
RET END
05-11 01:37