kiem tra btfss
ban can phai sua lai nhu sau:
Processor 16F877A
#include <P16F877A.INC>
ORG 0X0000
BCF STATUS,6
BCF STATUS,5
CLRF PORTB
BSF STATUS,5
BCF TRISB,1
BSF TRISB,0
BCF STATUS,5
MAIN
BTFSS PORTB,0
GOTO LOOP1
GOTO LOOP2
LOOP1
BSF PORTB,1
GOTO MAIN
LOOP2
BCF PORTB,1
GOTO MAIN
END
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