Our professor want us to make a sequence machine with timer

where :
RB[4-7]-LED
RD[4-7]-LED

INPUTS
INT0 START/STOP
INT1 SEQ SELECTOR

DELAY TIMER :TIMER0

INTERRUPT
INT0: RISING EDGE,HIGH PRIORITY
INT1: FALLING EDGE,LOW PRIORITY
TIMER: HIGH PRIORITY

Conditions:
-Single write to the out register(LATB)
-Seq Generation is at main
-Seq Selector will work on all mode
-Stop will pause the current state starting again will only resume the sequence
-At least 4 sequence
-Use assembler.asm

What I am having a problem here is that I cant understand how to use and what is interrupt , high priority, low priority, how to use rising and falling edge in a switch and I am still confuse how to use timer

Can you at least explain or give an example how to use this ?

below is the program our prof use to explain how to use a timer

 

Isn't there a textbook you can read?


Timer: http://www.8052.com/tuttimer.phtml
Interrupt: http://www.8052.com/tutint.phtml

 

I think this is not for pic18f4550 and for a source file asm

 

The source code looks definitely Picmicro you can get more info by going to the Pic site for not only the manual for the Pic, but several app notes with assembly language.
See the instruction set explanation also for each instruction.
PIC - Programmable Integrated Circuits: Source Code for PIC
Max.

 

I already get how to make rb0-rb1 a edge triggered but I still dont understand how will I PUT The 4 Sequences @ MAIN?

and in the previous program I post I dont know why do you need to use RETFIE FAST
and when you DECLARE RETURN where will it return?

 

The datasheet describes interrupts in Chapter 9. Priorities, edges, and so forth are controlled by those registers discussed.

John

 

can you please check if this correct this is only for SEQUENCE SELECTOR

 

I tried it in my board but it is not even blinking