[PIC] Multiplexer with PIC16F877

[anishpsla]

I want to use 4X1 (74153) multiplexer to my project. The output of the Mux is connected to a counter pin of PIC. I am confused about how to select common select Inputs. I am using RA1 and RA2 pins for this purpose.

 

[jayanth.devarayanadurga]

Connect pins 1 and 15 to ground to enable the outputs. For MUX 1 provide inputs to pins 3, 4, 5, 6. To select the input that is to select the input that should appear at output set pin 14 and 2 to 00, 01, 10 or 11.
Channel selection pins 14 and 2 are common for both the muxes.

 

[anishpsla]

Thanks for your reply. I need code example for giving 00,01,10 or 11 to channel selection pin.

 

[jayanth.devarayanadurga]

To set pin you use PORTx.Fx = 1 and to clear you use PORTx.Fx = 0 in mikroC.

 

[anishpsla]

But how to change portB.B0 = 0 portB.B1 = 0 next
portB.B0 = 0 portB.B1 = 1 next
portB.B0 = 1 portB.B1 = 0 and next
portB.B0 = 1 portB.B1 = 1 using MikroC . This is the real problem for me.

 

[jayanth.devarayanadurga]

You can also connect EN pins to micro and disable the outputs of MUX while switching the channels.

 

[anishpsla]

Thanks for the attachment. I got the idea for my program. Once again thanks for your quick reply.