[51] 74LS595 Error in Simulation Proteus

[tatbocmui]

I became familiar with the 74LS595, i want to make 1 2 3 on the OUTPUT of each of three 74LS595, but it always show 0 on three 74LS595. This is my simulation and code. Help me, please!!!

View attachment 74LS595.rar

 

[milan.rajik]

You want to display 1, 2 and 3 on 3 SSDs ? You have to clock in 24 bits of data and then give one more pulse to ST_CP store data on o/ps of 595.

 

[tatbocmui]

I think, i do the same like you talk, but the simulation in proteus is not correct

 

[zuisti]

Hi;
Just one comment:
Both 595 clock inputs (SHCP and STCP) require positive pulses (and working on the raising ie 0-1 edge).
For example (to storing) your instructions should be replaced:

IE74LS595_STCP = 1; //the raising edge
IE74LS595_STCP = 0;

Use the same order also for SHCP.

Sorry but I do not have such compiler to try it.

 

[milan.rajik]

Do you want to drive the enable pins of SSDs using HC595 ?

 

[tatbocmui]

Hi;
Just one comment:
Both 595 clock inputs (SHCP and STCP) require positive pulses (and working on the raising ie 0-1 edge).
For example (to storing) your instructions should be replaced:

IE74LS595_STCP = 1; //the raising edge
IE74LS595_STCP = 0;

Use the same order also for SHCP.

Sorry but I do not have such compiler to try it.

I also use the same as SHCP but it does not run

 

[arun_9998]

Try this i make some change in your code i think this helps you