67. Control Register Using Nested Bitfields

You are given a control register represented using nested struct bitfields. The register is 8-bit wide and divided into the following layout:

Your task is to:

• Simulate this register using nested struct and bitfields
• Implement a function that takes a pointer to the register and validates:
  • enable must be 1
  • priority must be less than or equal to 2
  • reserved must be all 0s

Return 1 if valid, else return 0.

Example-1

Input: 0x05 → 00000101
Output: 1

(enable=1, mode=0, priority=1, reserved=0)

Example-2

Input: 0x0F → 00001111
Output: 0

(priority=3, reserved=0)

Example-3

Input: 0x95 → 10010101
Output: 0

(reserved ≠ 0)