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Use this matrix keyboard to input MCU and insert P1.0~P1.6 of P1 port.
What I want to ask is when:
Press the P0.0 output of port 1 P0 high;
Press the 2 key P0.1 output high;
......
It's up to 8 keys.
There is also a requirement that when a key is pressed, it is delayed by 5 seconds and the other keys are locked, and after 5 seconds, it is returned to the starting point. Assembly language
;================================================= ====
As follows:
ORG 0000H
START:
MOV P0, #255
MOV P1, #255
CLR P1.0
NOP
JNB P1.4, K1
JNB P1.5, K2
JNB P1.6, K3
MOV P1, #255
CLR P1.1
NOP
JNB P1.4, K4
JNB P1.5, K5
JNB P1.6, K6
MOV P1, #255
CLR P1.2
NOP
JNB P1.4, K7
JNB P1.5, K8
JNB P1.6, K9
SJMP START
K1: CLR P0.0
SJMP DELAY
K2: CLR P0.1
SJMP DELAY
K3: CLR P0.2
SJMP DELAY
K4: CLR P0.3
SJMP DELAY
K5: CLR P0.4
SJMP DELAY
K6: CLR P0.5
SJMP DELAY
K7: CLR P0.6
SJMP DELAY
K8: CLR P0.7
DELAY:
MOV R5, #10
DJNZ R7, $
DJNZ R6, $ - 2
DJNZ R5, $-4
LJMP START
END
If you need to press the button to control the high level, change the CLR in the above program to SETB.
Then put: MOV P0, #255
Changed to: MOV P0, #0
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