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The 4-bit processors were programmed in assembly language or Forth, e.g. "MARC4 Family of 4 bit Forth CPU" [6] (which is now discontinued) because of the extreme size constraint on programs and because common programming languages (for microcontrollers, 8-bit and larger), such as the C programming language, do not support 4-bit data types (C ...
The COP400 or COP II is a 4-bit microcontroller family introduced in 1977 by National Semiconductor as a follow-on product to their original PMOS COP microcontroller. [1] COP400 family members are complete microcomputers containing internal timing, logic, ROM, RAM, and I/O necessary to implement dedicated controllers. [2]
The NEC μCOM series is a series of microprocessors and microcontrollers manufactured by NEC in the 1970s and 1980s. The initial entries in the series were custom-designed 4 and 16-bit designs, but later models in the series were mostly based on the Intel 8080 and Zilog Z80 8-bit designs, and later, the Intel 8086 16-bit design.
Holtek Semiconductor is a major Taiwan-based designer of 32-bit microcontrollers, 8-bit microcontrollers and peripheral products. Microcontroller products are centred around an ARM core in the case of 32-bit products and 8051 based core and Holtek's own core in the case of 8-bit products.
In 2002, about 55% of all CPUs sold in the world were 8-bit microcontrollers and microprocessors. [11] Over two billion 8-bit microcontrollers were sold in 1997, [12] and according to Semico, over four billion 8-bit microcontrollers were sold in 2006. [13] More recently, Semico has claimed the MCU market grew 36.5% in 2010 and 12% in 2011. [14]
The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. Sold for US$60 (equivalent to $450 in 2023 [2]), it was the first commercially produced microprocessor, [3] and the first in a long line of Intel CPUs.
Texas Instruments TMS1100 microcontroller inside the Parker Brothers Merlin electronics game. The TMS1000 is a family of microcontrollers introduced by Texas Instruments in 1974. [ 1 ] [ 2 ] [ 3 ] It combines a 4-bit central processor unit , read-only memory (ROM), random access memory (RAM), and input/output (I/O) lines as a complete "computer ...
The National Semiconductor COP8 is an 8-bit CISC core microcontroller. COP8 is an enhancement to the earlier COP400 4-bit microcontroller family. COP8 main features are: Large amount of I/O pins; Up to 32 KB of Flash memory/ROM for code and data; Very low EMI; Many integrated peripherals (meant as single chip design)
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