Open wide, here comes the spoon:

		dseg

		org	040h

pwmreg:		ds	5

pwmset0:	ds	1
pwmset1:	ds	1
pwmset2:	ds	1
pwmset3:	ds	1
pwmset4:	ds	1

		cseg

		org	0

		jmp	Init

		org	00400h

Init:		mov	pwmset0,#1
                mov	pwmset1,#50
                mov	pwmset2,#100
                mov	pwmset3,#150
                mov	pwmset4,#200

Pwm:		mov	r0,#pwmreg
		inc	@r0
		mov	a,@r0
		cjne	a,pwmset0,$+3
		mov	p0.0,c

		inc	r0
		inc	@r0
		mov	a,@r0
		cjne	a,pwmset1,$+3
		mov	p0.1,c

		inc	r0
		inc	@r0
		mov	a,@r0
		cjne	a,pwmset2,$+3
		mov	p0.2,c

		inc	r0
		inc	@r0
		mov	a,@r0
		cjne	a,pwmset3,$+3
		mov	p0.3,c

		inc	r0
		inc	@r0
		mov	a,@r0
		cjne	a,pwmset4,$+3
		mov	p0.4,c

		jmp	Pwm

This took me 10 minutes to type. It's quick, dirty, of course it's not been tested, and I haven't even tried to assemble it.

In the likely case that you are a lazy student: I provided you with this code for the purpose of getting this message through to you (and other lazy students everywhere). You did not write this, I did. Maybe you have a copy now, but you are still unable to do this yourself. By presenting this code as your own, you will be cheating yourself. If this code gets you a good grade, you will get a good grade for something you are not actually capable of. Because you did not bother to try and write this by yourself, you will not have developed your skills in any way, and after you leave school, you will still be unable to do this on your own steam. I however don't have to worry if I can cope with what people throw at me. I know what I can and can not do, and do not have to lie about it. I don't have to be ashamed of myself. It's up to you how much you can rely on yourself in the future.