Counters and Registers
447
Figure 11.31 Hardware implementation of the counter circuit (example 11.9).
Table 11.13 Example 11.9.
Present state
Next state
Inputs
C
B
A
C
B
A
J A
K A
J B
K B
J C
K C
0
0
0
0
1
0
0
X
1
X
0
X
0
0
1
X
X
X
X
X
X
X
X
X
0
1
0
1
0
1
1
X
X
1
1
X
0
1
1
X
X
X
X
X
X
X
X
X
1
0
0
X
X
X
X
X
X
X
X
X
1
0
1
1
1
0
X
1
1
X
X
0
1
1
0
0
0
0
0
X
X
1
X
1
1
1
1
X
X
X
X
X
X
X
X
X
11.12 Shift Register
A shift register is a digital device used for storage and transfer of data. The data to be stored could be
the data appearing at the output of an encoding matrix before they are fed to the main digital system
for processing or they might be the data present at the output of a microprocessor before they are fed