MOV A，m 1；

CJNE A, M2, LOOP// A-M2, only generate flag bits, and execute them in turn downwards.

LOOP:JNC LOOP 1； // Cy = 0 transmission.

MOV A，M2； // Cy = 1 to execute this line.

LOOP 1:MOV MAX，A； //

RET

There is only one JNC in the program, which plays a transfer role, (skipping a line,) and the others are executed sequentially.

MOV A and M2 with no function are executed again.