Cycle Delay

assembly/timer/codes/cycle_delay.asm

@@ -1,37 +1,41 @@
-.include "/home/gadepall/m328Pdef.inc"
-ldi r31,0b00100001
-out DDRB,r31
-ldi r16, 0
-out SREG , r16
-ldi r16 ,low (RAMEND) 
-out SPL , r16
-ldi r16 ,high (RAMEND) 
-out SPH , r16
+;.include "/home/gadepall/m328Pdef.inc"
+.include "/sdcard/Download/latex/digital-design/trunk/assembly/setup/m328Pdef/m328Pdef.inc"
+ldi r31,0b00100000
+out DDRB,r31 ;Defining Pin 13 as output
+ldi r16, 0 
+out SREG , r16 ;Clearing Status register
+ldi r16 ,low (RAMEND) ;Lower byte of address is stored in r16
+out SPL , r16 ;Lower byte of address is moved to SPL
+ldi r16 ,high (RAMEND) ;Higher byte of address is stored in r16
+out SPH , r16 ;Higher byte of address is moved to SPH
 ldi r27,0b00000000
-ldi r28,0b00000001
+ldi r28,0b00100000
 comp:
-eor r27,r28
+eor r27,r28 ;To blink the LED
 out PORTB,r27
 call wait
 rcall comp
 
 wait:
-    push r16
-    push r17
-    push r18
+     push r16
+     push r17
+     push r18
 
     ldi r16,0x50
     ldi r17,0x00
     ldi r18,0x00
 
 w0:
-    dec r18
-    brne w0
+    dec r18 
+    brne w0 ;loop breaks after running 256 times
     dec r17
-    brne w0
+    brne w0 ;loop breaks after running 256 times
     dec r16
-    brne w0
+    brne w0 ;loop breaks after running 80 times
     pop r18
     pop r17
     pop r16
     ret
+
+    ;Calculated delay is around 0.32768 sec
+    ;Actual delay is around 1 sec

assembly/timer/codes/cycle_delay.hex

@@ -1,6 +1,6 @@
 :020000020000FC
-:10000000F1E2F4B900E00FBF0FEF0DBF08E00EBF43
-:10001000B0E0C1E0BC27B5B90E940F00FBDF0F9331
+:10000000F0E2F4B900E00FBF0FEF0DBF08E00EBF44
+:10001000B0E0C0E2BC27B5B90E940F00FBDF0F9330
 :100020001F932F9300E510E020E02A95F1F71A9531
 :0E003000E1F70A95D1F72F911F910F910895D6
 :00000001FF