Page 1103 - Basic Electrical Engineering
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Figure 16.24 A JK flip-flop converted into T flip-flop
Figure 16.25 Master—slave JK flip-flop
16.11.8 Arithmetic Circuits
Combinational logic circuits are used to make adders and subtractors. In the
central processing unit (CPU) of a computer, arithmetic functions are
performed in a section called arithmetic logic unit (ALU). This section can
perform functions like add, subtract, multiply, dvide, compare, complement,
shift, and perform logic functions like AND, OR, and XOR.
16.11.9 Memory Function or Data Storage
You must have seen floppy disks and CD-ROMs. CD-ROM (compact disk
read-only memory) is an optical storage device which can store many
thousands of typed pages of information. Such optical disks can store much
more data than floppy disks. Flip-flops form the basic memory cell.
Some semiconductor memory devices are RAM (random-axis memory),
ROM (read-only memory), PROM (programmable read-only memory),
EPROM (erasable PROM), etc. The hard disk drive is currently the most
