12-bit

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Bit
1	4	8	12	16	18	24	31	32	36	48	60	64	128	256	512
Application
				16				32				64
Floating point precision
				×½				×1				×2	×4
Floating point decimal precision
								32				64	128
v t e

In computer architecture, 12-bit integers, memory addresses, or other data units are those that are at most 12 bits (1.5 octets) wide. Also, 12-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. Possibly the best-known 12-bit CPU is the PDP-8 and its relatives, such as Intersil 6100 microprocessor produced in various incarnations from August 1963 to mid-1990. Many ADCs (analog to digital converters) have a 12-bit resolution. Some PIC microcontrollers use a 12-bit word size.

12 binary digits have 4096 (10000 octal, 1000 hexadecimal) distinct combinations. Hence, a microprocessor with 12-bit memory addresses can directly access 4096 bits (4KiB) of word-addressable memory.

References

DIGITAL Computing Timeline: 12-bit architecture

v t e CPU technologies

Architecture	Harvard Modified Harvard von Neumann Dataflow Comparison

Instruction set	ASIP CISC EDGE EPIC MISC OISC RISC VLIW NISC ZISC

Word size	1-bit 4-bit 8-bit 9-bit 10-bit 12-bit 15-bit 16-bit 18-bit 22-bit 24-bit 25-bit 26-bit 27-bit 31-bit 32-bit 33-bit 34-bit 36-bit 39-bit 40-bit 48-bit 50-bit 60-bit 64-bit 128-bit 256-bit 512-bit variable

Pipeline	Instruction pipelining In-order & out-of-order execution Branch predictor Register renaming Speculative execution Hazards Bubble

Parallel level	Bit Bit-serial Word Instruction Scalar Superscalar Data Vector Task Thread

Multithreading	Temporal multithreading Simultaneous multithreading Hyper-threading

Flynn's taxonomy	SISD SIMD MISD MIMD SPMD

Types	Digital signal processor Microcontroller System on a chip Cellular

Components	Arithmetic logic unit Barrel shifter Floating-point unit Back-side bus Multiplexer Demultiplexer Registers Memory management unit Translation lookaside buffer Cache Register file Microcode Control unit Clock rate

Power management	APM ACPI Dynamic frequency scaling Dynamic voltage scaling Clock gating

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