chapter 7inc.kmutt.ac.th/course/inc222/document/chapter7.pdf · mod-8 synchronous up-down counter...
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Chapter 7Counters and Registers
Asynchronous (Ripple) Counters
Chapter 7 Counters and RegistersINC222 Logic Theory and Digital Circuit Design
Frequency Division
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Example for clock display
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Mod-6 Counter from Mod-8
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
a) Mod-14 Ripple Counterb) Mod-10 (Decade) Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Mod-60 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74LS293 asynchronous counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74LS293 as Mod-16 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74LS293 as Mod-10 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74LS293 & AND Gate as Mod-14 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
2 74LS293 as Mod-60 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Ideal waveforms of Mod-8 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Actual waveforms, including propagation delays
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Synchronous Mod-16 Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Mod-8 Synchronous Up-Down CounterUp/Down = 1 => Count upUp/Down = 0 => Count down
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Presettable parallel counter with asynchronous preset
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74ALS193 up/down synchronous counter with asynchronous preset and reset
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Example Waveforms of 74HC193
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
74LS193 as Mod-5 Down Counter
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
Cascade Connection for 74HC193
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Using AND Gates to Decode a MOD-8 Counter
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Decoding Circuit which Active During Stage 1000 and 1110
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Glitches Occurring on Decoding Circuits
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Eliminate glitches (spikes) by using strobe signal
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
BCD Counters to display 000 - 999
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Synchronous Counter DesignPRESENT State NEXT State
C B A C B A1 0 1 0 1 1
Transition at Output
PRESENT State Q(N)
NEXT State Q(N+1) J K
0 0 0 0 0 x0 1 0 1 1 x1 0 1 0 x 11 1 1 1 x 0
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Synchronous Circuit Design starting from State Transition Diagram
C B A0 0 00 0 10 1 00 1 11 0 00 0 00 0 1
etc.
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
PRESENT State NEXT StateC B A C B A
Line 1 0 0 0 0 0 12 0 0 1 0 1 03 0 1 0 0 1 14 0 1 1 1 0 05 1 0 0 0 0 06 1 0 1 0 0 07 1 1 0 0 0 08 1 1 1 0 0 0
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Excitation Table and K-Map for JA
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
K-Map for JC ,KC , JB and KB
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Final Implementation of Synchronous Circuit Design
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Design Synchronous Counter Circuit for Driving Stepper Motor
31
24
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
K maps for JB, KB, JA and KA
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Final Implementation for Synchronous Stepper Motor Driver Circuit
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Integrated-Circuit Registers Parallel in / parallel out (PIPO) Serial in / serial out (SISO) Parallel in / serial out (PISO) Serial in / parallel out (SIPO)
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
PIPO-The 74ALS174 / 74HC174
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
The 74ALS174 wired as a shift register
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
SISO – The 4731B
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
The 4731B shift registers
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
PISO-The 74ALS165/74HC165
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
SIPO-The 74ALS164/74HC164
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Shift-Register Counters Ring Counter
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Shift-Register Counters Starting a Ring Counter
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Shift-Register Counters Johnson Counter
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Decoding a Johnson Counter
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design
Quiz: Design synchronous counter for this state diagram
000
100
101
001
CBA
011
111
010
110
Chapter 7 Counters and Registers
INC222 Logic Theory and Digital Circuit Design Chapter 7 Counters and Registers