mod 60 counter with start/stop and reset button

[NewGeek]

I need help in this. The circuit is done using a Multisim file. When S is pressed, it will start to count from 00 to 59. When S is pressed again, it will pause the counting while R will reset it to 00. Problem is why the counter cannot count again after reaching 00 and I must press S to start it again? Is there any modification or additional logic gates to be added?

[Thomas W]

What does the text say on the pins of 74LS93N?

[NewGeek]

Here is where each pins are connected on the 74ls93.
Pin 1- CP1
Pin 2- Master Reset
Pin 3- Master Reset
Pin 5- VCC
Pin 8- Q2
Pin 9- Q1
Pin 10- Ground
Pin 11- Q3
Pin 12- Q0
Pin 14- CP0

Pins 4,6,7 and 13 are not connected.

[Thomas W]

I would like to see a zoomed in version of the schematic, so that the text on the 74LS93N is readable?

[spnrajan]

I need help in this. The circuit is done using a Multisim file. When S is pressed, it will start to count from 00 to 59. When S is pressed again, it will pause the counting while R will reset it to 00. Problem is why the counter cannot count again after reaching 00 and I must press S to start it again? Is there any modification or additional logic gates to be added?

[piratepaul]

Off the top of my head, I have not looked up the numbers... surely 00 must have a logic, so if you include another chip which outputs a 1 when and only when its input is that logic and feed it back to S ... it will work... hmmm off the top[ of my head!.