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Author: AashiDutt

Timer_interface/output.png

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+ORG 00H
+
+MOV  TMOD,  #01H // mode 1 (16 bit timer moder) ,timer 0
+again1:        // while loop
+// led blink code 
+MOV P1, #0FFH  // logic 1
+ACALL DELAY  
+MOV P1, #00H   // logic 0
+ACALL DELAY
+SJMP again1    // short jump 
+
+// delay of 5ms 00H (0) TO 0EEH
+//  1 count = 1.085us
+//  4608 counts = 5ms
+//  max counts = 65536  (2^16)
+// so 65536 - 4608 = 60928 counts =EE00 (in hex)
+
+DELAY: MOV TL0, #00H
+MOV TH0, #0EEH
+SETB TR0      // to turn ON the timer(timer 0 control run bit)
+again: JNB TF0 ,again // flag bit when there is roll over from fffh to 000h(overflow flag)
+CLR TR0               // JNB - jump if bit is not set
+CLR TF0
+RET
+
+END