Hello Need help for Counter circuit. Basically, I would like to start count with pressing of push bottom switch. and stop and hold the output by pressing same switch again. And press to restart counting and so on.. Currently I am using 74LS191 for counter. From data sheet, what i understand is to control by using LOAD and EN pin. currently i am using push button switch to generate pulse for LOAD pin and same pulse connect to JK Flip Flop(toggle mode) to generate 1 and 0 for EN pin. For counting is working ok, but when press switch again, it reset everything and count again. How to make it for LOAD pin(not to receive signal) when press 2nd time and just toggle for enable pin to stop and hold? I tried to make use of 2 input- NAND gate(input 1: JK FF output Q, input2 : switch ouput) before connect to LOAD pin but it still resetting the count. Kindly plz advice..