How to Design a Glitch-Free Modulo-2 Up/Down Counter Using CD4027 XNOR Output?

Hi everyone, I tried to design a modulo-2 to get this sequence 00,01,10,11,01,10,00. But glitch append at the ouput of the XNOR (cd4027) and trig the flipflop

randomly. So do you have any suggestions to design this circuit?

It sounds as if you have a design. It would make it easier for us to help if you shared your existing design.

Hi.
This is in image is a solution using the MCU pic12f675.

Here's the listing:

#chip pic12f675,4
Dim TestVar(7)
dim k as integer
TestVar = 0,1,2,3,1,2,0 ' 00b,01b,10b,11b,01b,10b,00b
for k=1 to 7
GPIO=TestVar(k)
wait 1 s
next k

And here the buinary file:

:020000040000FA
:020000000528D1
:1000080009004F208316850158308400073080008E
:10001800840A8001840A01308000840A023080004A
:10002800840A03308000840A01308000840A023088
:100038008000840A8001AB01AC01AB0A0319AC0A49
:1000480058302B0784000008831285000130A40073
:1000580047202B08A5002C08A6000730A900AA01F4
:100068005C202018212863003728A30A8E30A100BD
:100078000130A000A00B3E28A10B3C28A20B3A2877
:10008800A30B3A280800E830A2000330A300392067
:10009800A40B47280800FF238316900083129F13A0
:1000A8001F1083169F0107308312990085010800ED
:1000B800A001A61F7628AA1B6328A0090800250905
:1000C800A7002609A800A70A0319A80A2909A50054
:1000D8002A09A600A50A0319A60A2708A9002808BC
:1000E800AA007828AA1B080026082A02031C080070
:1000F8002A082602031C8428290825020318080058
:04010800A009080042
:02400E00D43F9D
:00000001FF


Regards
Giovanni Di Maria

Hi
You can use also IC CD4510 and CD4511, respectively counter and decoder for display 7-segment Led
Giovanni