Rise and rise again until lambs become lions

Rise and rise again until lambs become lions Logic Design LAB 9 授課老師：伍紹勳 課程助教：邱麟凱、江長庭

Outline Rise and rise again until lambs become lions Generate clock by IC 555 oscillator Implement count up counter by JK flip-flop – 7476 JK flip-flop – count up counter

Requirement Rise and rise again until lambs become lions 220Ω電阻x 4 、7476 x 2、7400(NAND) x 1(buffer)、LED x 4、 7476 x 2、555 x 1、電阻 470 KΩx 2(黃紫黃)、電解電容 1μF x 1

555 oscillator Refer to exp. 11 555 Calculator (Website) Rise and rise again until lambs become lions

Rise and rise again until lambs become lions 555 oscillator You can connect output of 555 to a buffer – Oscillator would be more stable – E. g. connect output of 555 to an inverter or AND output of 555 with signal 1 Electrolytic capacitor(電解電容) – With polarity (long pin should connect to VCC) + -

7476 Dual Master-Slave J-K Flip-Flops with Complementary Outputs Falling-edge Trigger JK Flip-Flop Preset Reset Toggle Rise and rise again until lambs Clear, and become. Preset, lions

Count up counter Rise and rise again until lambs become lions 0000 20: 0 ->1 (Toggle) 0001 0010 20: 1 ->0 (Toggle), carry to next digit 21: 0 ->1 (Toggle) 20: 0 ->1 (Toggle) 0011 0100 20: 1 ->0 (Toggle), carry to next digit 21: 1 ->0 (Toggle), carry to next digit 22: 0 ->1 (Toggle)

Rise and rise again until lambs become lions Count up counter 4 -bits output – output=input+1 at falling edge 0000 0001 0010 0011 +1 1111 0100 0101 1110 0110 1101 0111 1100 1011 1010 1001 1000