0x3FFF

0x3FFF is a hexadecimal numeric constant used in computing. It represents the decimal value 16383, which is 2^14 - 1, the maximum unsigned value that can be stored in 14 bits. In binary it is 0011 1111 1111 1111, and in 16-bit words the high byte is 0x3F and the low byte is 0xFF; in little-endian memory it may appear as FF 3F.

Because it has all lower 14 bits set, 0x3FFF is often used as a bitmask to extract or limit to the least significant 14 bits: result = value & 0x3FFF. It also marks the upper boundary of a 16 KB block in systems that partition the 16-bit address space into 0x0000–0x3FFF and 0x4000–0x7FFF ranges, with the latter starting at 0x4000. Thus 0x3FFF is the maximum addressable value within the 0x0000–0x3FFF range.

In software and hardware design, 0x3FFF appears in documentation and code for masking, indexing, or parameter limits, especially in contexts that use 14-bit addressing or memory banks divided into 16 KB units. Its significance is largely situational and tied to the use of 14-bit fields rather than representing a universal standard.

See also: 0x4000, 2^14, bitmask, endianness.