Which type of flip flops are used in registers ?

Registers are digital circuit components used for the high-speed storage of data bits within a processor. The D (Data or Delay) flip-flop is the most commonly used type in registers. This is because a D flip-flop captures the value of the input (D) at a specific point in the clock cycle (usually the rising edge) and holds that value at its output (Q) until the next clock pulse, making it ideal for simple data storage.

• SR flip-flops are rarely used because they have an invalid/forbidden state when both inputs are high.
• JK flip-flops and T flip-flops are more complex and are typically preferred for designing counters and frequency dividers rather than simple storage registers.