You mean which pins in the Port P1...



Who said BCD is sent to the 7-segment display?



It shouldn't be that difficult:

You know that a 7-segment display has 8 LEDs in it (one for each segment, plus the DP);

You know that an 8051 Port has 8 pins;

The code uses meaningful labels like display_0, display_8, etc

You know that displaying an '8' must light all the segments;

You know that displaying a '0' must light all the segments except one.

So let's apply that knowledge to the code:

Save This Code

display_0:
	mov	P1, #00001001b
	ret

Save This Code

display_8:
	mov	P1, #00000001b
	ret

From just those two, I think it should be easy to guess that:

b0 (the LSB) is the DP;

writing a 0 to a pin turns the LED ON;

the middle segment (g) is connected to b3

You should be able to take it from there...