WEBVTT 00:07.700 --> 00:13.480 Welcome to the base is three universal shift register lecture and I'm going to show you how the universal 00:13.520 --> 00:19.130 shift British search should be implemented on your basis three board and what we have is that we have 00:19.130 --> 00:27.860 eight inputs which are shown from our switch to zero to switch 7 and we have two selectors which indicate 00:27.950 --> 00:34.760 the mode of operation for our universal shift register and there are the two left most switches at the 00:34.760 --> 00:36.520 bottom of your bases three board. 00:36.770 --> 00:45.290 And then we have a clock input and a ready set in our clock is the center button and a reset is a top 00:45.290 --> 00:46.070 button. 00:46.070 --> 00:53.630 So if we have both of our selector inputs as a one which are indicated by our two switches in the up 00:53.630 --> 00:57.510 position we are going to perform a parallel load. 00:57.510 --> 01:03.830 And what that will do is take the status of the input switches and load them onto the corresponding 01:03.830 --> 01:04.790 Ltds. 01:05.090 --> 01:08.600 So right now we have all them up as a 1. 01:08.600 --> 01:15.200 So if I press the middle button which is our clock you'll see that we have loaded all of the outputs 01:15.290 --> 01:18.610 with a one every every value in the shift register. 01:18.620 --> 01:25.060 So now let's go ahead and move our selector switch down so we have it as a 1 0. 01:25.250 --> 01:28.640 And what this will do is shift our inputs to the left. 01:28.640 --> 01:31.920 Every time I push the clock so I'm going to push the clock once. 01:32.150 --> 01:39.320 And you'll notice that all the inputs are still lit up except for the brightness output and that's indicated 01:39.320 --> 01:41.870 that we have shifted everything to left. 01:42.050 --> 01:47.870 So we have a zero there and if I press it again we'll notice that the same thing occurs except now we 01:47.870 --> 01:49.690 have two zeros. 01:49.790 --> 01:54.980 So we've tooken over outputs and shifted them to bits to the left. 01:54.980 --> 02:03.020 So let's flip the the selector switches so we have it as a 0 1 which we now should shift everything 02:03.020 --> 02:03.980 to the right. 02:03.980 --> 02:11.780 So when I push the clock button we should see that all of the Ltds are lit up except for the rightmost 02:11.780 --> 02:13.520 one and the leftmost. 02:13.520 --> 02:17.960 So go ahead and press the clock button and you'll notice that they're all lit up except for the two 02:17.990 --> 02:20.230 outside ladies. 02:20.480 --> 02:27.140 Now if I just keep pressing the clock but never time I press that we will keep moving the output. 02:27.140 --> 02:32.990 So if I press it enough times you notice that we have one I press that again we have zero. 02:32.990 --> 02:38.830 So I want to go ahead and parallel load again let's move both of our selector switches to one and just 02:38.840 --> 02:45.740 kind of change the status so he got some ones and some zeros and then let's press our clock button. 02:45.770 --> 02:52.280 So now we've loaded our shift register and if we want to go ahead and clear that we can just move our 02:52.280 --> 02:56.540 selector switches to the left or to the right and just clock all the way through. 02:56.540 --> 03:02.450 However if we want to do it on one clock cycle we can use our reset which we know that occurs on a clock 03:02.450 --> 03:02.840 cycle. 03:02.840 --> 03:07.210 So if I just press my reset you'll notice that nothing resets. 03:07.220 --> 03:08.530 Nothing actually happens. 03:08.720 --> 03:10.880 And that's because you reset your clock. 03:10.880 --> 03:12.350 Have to happen together. 03:12.530 --> 03:17.330 So push or reset and then push the clock button while holding down the reset. 03:17.360 --> 03:20.480 And that should reset our shift register. 03:20.480 --> 03:25.730 So let's go ahead and hold the clock and hold down the reset press the clock and you notice that all 03:25.730 --> 03:28.290 the ladies have been cleared out. 03:28.640 --> 03:32.340 And that is how the universal shift register should work on your bases through board.