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Difference between revisions of "4-bit architecture"

(→‎4-bit microcontrollers)
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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 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|4004]] and the [[Intel 4040|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.
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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.
  
 
== Applications ==
 
== Applications ==
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Most 4-bit [[microprocessor]]s were used almost exclusively in calculators and toys. 4 bits was a logical choice for many calculators that used [[binary coded decimal|BDC]] numbers representation.
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Most 4-bit [[microprocessor]]s were used almost exclusively in calculators and toys. 4 bits was a logical choice for many calculators that used [[binary coded decimal|BDC]] numbers representation. Today, 4-bit chips such as {{epson|S1C63}} are still manufactured are used in many low-power devices and wireless tools.
  
 
== 4-bit microprocessor ==
 
== 4-bit microprocessor ==
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== 4-bit microcontrollers ==
 
== 4-bit microcontrollers ==
 
* {{ami|S2000 series|AMI S2000}}
 
* {{ami|S2000 series|AMI S2000}}
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* [[Epson S1C63]]
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* {{epson|S1C63|Epson S1C63}}
 
* {{fujitsu|MB8840|Fujitsu MB8840}}
 
* {{fujitsu|MB8840|Fujitsu MB8840}}
 
* {{fujitsu|MB8850|Fujitsu MB8850}}/{{fujitsu|MB88500|500}}
 
* {{fujitsu|MB8850|Fujitsu MB8850}}/{{fujitsu|MB88500|500}}

Revision as of 04:21, 10 November 2015

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. Both the Intel 4004 and the 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- and 12-bit architecture 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 microprocessor

4-bit microcontrollers

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