I am a new to PICs programming and am into it as a hobby.
I am looking for a delay loop. Attached with this email is the code
generated by http://www.piclist.com/techref/microchip/delays.htm as
mentioned in one of previous emails for the subject.

I do not understand some of the code. Will you be kind enough to clear the
problems I am facing.

The Problems are mentioned in order of occurrence below:

Problem no 1: Mentioned is Actual delay = 0.5 seconds = 500000 cycles
   What I do not understand is that the clock speed is 4000,000 CPS.
   With this speed, the cycles for 0.5 seconds delay should have been =
   4000,000/2=2000,000 Cycles.

Problem no 2: What is cblock?
Problem no 3: What is $+1?
Problem no 3: How is it mentioned 2 cycles & 4 cycles?

; Delay = 0.5 seconds
; Clock frequency = 4 MHz

; Actual delay = 0.5 seconds = 500000 cycles
; Error = 0 %

           cblock
           d1
           d2
           d3
           endc

Delay
                               ;499994 cycles
           movlw          0x03
           movwf          d1
           movlw          0x18
           movwf          d2
           movlw          0x02
           movwf          d3
Delay_0
           decfsz         d1, f
           goto           $+2
           decfsz         d2, f
           goto           $+2
           decfsz         d3, f
           goto           Delay_0

                               ;2 cycles
           goto           $+1

                               ;4 cycles (including call)
           return



UbaidUllah

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