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Difference between revisions of "4-bit architecture"

m (→‎4-bit microcontrollers)
(I've reordered the industry section to put the first microprocessor first (this makes more sense chronologically), and also added some details about the intel 4004, 4040. I left off their address space b/c the intel 4004/4040 are different (12 bit/13 bit))
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{{Architecture sizes}}
 
{{Architecture sizes}}
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The '''4-bit [[computer architecture|architecture]]''' is a [[microprocessor]] architecture that has a [[datapath]] width or a highest [[operand]] width of 4 bits or a [[nibble]]. These architectures typically have a matching [[register file]] with [[registers]] width of 4 bits and 4-8-bit wide addresses.
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The '''4-bit [[Computer architecture|architecture]]''' is a [[microprocessor]] architecture that has a [[datapath]] width or a highest [[operand]] width of 4 bits or a [[nibble]]. These architectures typically have a matching [[register file]] with [[registers]] width of 4 bits and 4-8-bit wide addresses.
  
 
== Industry ==
 
== Industry ==
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Most of the first [[microprocessor]]s during the early 1970s had 4-bit [[word]] length. Both the Intel {{intel|4004}} and the {{intel|4040}} were 4-bits. The world's first single-chip microprocessor by Texas Instruments, the [[TMS1000]], was also a 4-bit CPU. 4-bit word were proven to be very limiting and by 1974 there was a shift to larger architectures such as [[8-bit architecture|8-]] and [[12-bit architecture]] architectures. Some 4-bit chips are still made to date such as the {{epson|S1C63|Epson S1C63}} MCU.
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Most of the first [[microprocessor]]s during the early 1970s had 4-bit [[word]] length. The world's first single-chip microprocessor by Texas Instruments, the [[TMS1000]], was a 4-bit CPU. Both the Intel {{intel|4004}}, the first commercial microprocessor, and the {{intel|4040}} had a 4-bit word length, but had [[8-bit architecture|8-bit]] instructions. 4-bit word were proven to be very limiting and by 1974 there was a shift to larger architectures such as 8-, [[12-bit architecture|12-]] architectures. Some 4-bit chips are still made to date such as the {{epson|S1C63|Epson S1C63}} MCU.
  
 
== Applications ==
 
== Applications ==

Revision as of 13:05, 16 January 2016

Architecture word sizes
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The 4-bit architecture is a microprocessor architecture that has a datapath width or a highest operand width of 4 bits or a nibble. These architectures typically have a matching register file with registers width of 4 bits and 4-8-bit wide addresses.

Industry

Most of the first microprocessors during the early 1970s had 4-bit word length. The world's first single-chip microprocessor by Texas Instruments, the TMS1000, was a 4-bit CPU. Both the Intel 4004, the first commercial microprocessor, and the 4040 had a 4-bit word length, but had 8-bit instructions. 4-bit word were proven to be very limiting and by 1974 there was a shift to larger architectures such as 8-, 12- architectures. Some 4-bit chips are still made to date such as the Epson S1C63 MCU.

Applications

Most 4-bit microprocessors were used almost exclusively in calculators and toys. 4 bits was a logical choice for many calculators that used BDC numbers representation. Today, 4-bit chips such as S1C63 are still manufactured are used in many low-power devices and wireless tools.

4-bit microprocessors

4-bit microcontrollers

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