How to send up down signal to MAX5160LEUA

Hi ,
I want to have a digital pot so I got a MAX5160LEUA IC[1] , Now I have a some doubt in program the Micro controller for controlling the MAX5160 digital pot .
I have connected a load between H and L pins and trying to send HIGH signal (to UP/Down) pin . but there is no change load current ..

Can you pls help how to send proper signal to the UP/Down pin ..?

[1] https://www.alldatasheet.com/datasheet-pdf/pdf/434454/MAXIM/MAX5160LEUA.html

If CS is made low and then U/D is made high and then a high to low transition of INC pin increments the internal up/down counter and thus increases the resistance between W and L.

When both CS and U/D are low a high to low on INC pin decrements the internal counter and hence resistance.

Hi,

I have tried connecting with controller but no output .
below is my code which had tried .
And I am using MAX5161 , it does not have any CS pin so I have to control onl up/down and INC pins

Pls check my code and let me know where I am making mistakes


void delay(unsigned int i)
{
unsigned int j,k;
for(j=0;j<=i;j++)
{
for(k=0;k<256;k++);
}
}



void makeUp(int noTimes)
{

P0 |= 0x40; // UP_DOWN I have connected UP down pin to 7th pin of Microcontroller
delay(500);
P0 |= 0x80;
delay(500);
P0 &= ~0x80; // INC I have connected UP down pin to 8th pin of Microcontroller
delay(500);

return;

}

void makeDown(int noTimes)
{

P0 |= 0x40; // UP_DOWN
delay(500);
P0 |= 0x80;
delay(500);
P0 &= ~0x80; // INC
delay(500);

return;

}