Purpose of the CTR DIV 8 block in a serial data path (counter divides by 8) In a system using a divide-by-8 counter labeled “CTR DIV 8” along with a control flip-flop, data output register, and a one-shot, what is the function of the divide-by-8 stage within the overall operation?

Introduction / Context:
Divide-by-N counters are often used in serial interfaces to count received bits and control when a byte-wide register is latched or transferred. A “CTR DIV 8” suggests a modulo-8 counter, ideal for 8-bit (one byte) data framing in many systems.

Given Data / Assumptions:

• The counter divides by 8 (tracks 8 bit times).
• A control flip-flop, an output register, and a one-shot are present.
• Typical serial byte width is 8 bits (not counting start/stop/parity).

Concept / Approach:
As serial bits arrive, the divide-by-8 counter increments one count per bit time. After eight counts, it signals “byte complete,” enabling a transfer or load of the parallel output register. A one-shot can generate a precise strobe or reset pulse to reinitialize the counter and control logic for the next byte.

Step-by-Step Solution:

Verification / Alternative check:
Observe timing: every eighth bit, a strobe occurs and the counter resets, yielding a repeating byte boundary.

Why Other Options Are Wrong:

• Dividing to match serial input rate (a): generic and not specific to byte framing.
• Option (b): too convoluted and implies the counter enables storage before counting all bits.
• Parity verification (c): parity requires XOR logic, not just a divide-by-8 counter.

Common Pitfalls:
Confusing clock division with bit counting for framing; overlooking the role of a one-shot as a strobe/reset generator.

Final Answer:
It keeps track of the eight data bits, triggering the transfer of the data through the output register and the one-shot, which then resets the control flip-flop and divide-by-8 counter.