lcd functions in Mplabx

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beauty world

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Hi friends.I see that in all of program with LCD In mplabx c8 compiler,3 function delay use.
Code: 
void DelayFor18TCY(void){
    NOP();  NOP();  NOP();  NOP();
    NOP();  NOP();  NOP();  NOP();
    NOP();  NOP();  NOP();  NOP();
    NOP();  NOP();
    return;}

void DelayPORXLCD(void){           //15ms delay
    Delay1KTCYx(30);
}

void DelayXLCD(void){            //5ms delay
__delay_ms(5);
}[CODE]
[/CODE]

i have 2 questions:
1.why we use 3 function delay with each other?
2.and if every NOP()give 1 cycle delay why we use 14 NOP() for 18 cycle delay?
 

Dear beauty world

question number 1 : In the code provided the delays has got nothing to do with each other.
question number 2 : You will notice that the sub routine is called " DelayFor18TCY ". A " Call " instruction is 2 clock cycles and a " Return " is 2 instruction cycles which gives 18 clock cycles.

DevED

 
sorry I didn't catch ur answer about number 1.can u explain more?can we use just one of them in program or we should wirte all delay functions?
andTnx for ur answering.
 

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