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{{motorola title|MC14500B}}
 
{{motorola title|MC14500B}}
−
{{mpu
+
{{chip
 
| name                = Motorola MC14500B
 
| name                = Motorola MC14500B
−
| image              = <!-- actual image to use                                                    -->
+
| image              = MC14500BCP.jpg
−
| caption            = <!-- caption for the image specified                                        -->
+
| caption            = 1-bit MC14500BCP
 +
| designer            = Motorola
 
| manufacturer        = Motorola
 
| manufacturer        = Motorola
 
| model number        = MC14500B
 
| model number        = MC14500B
−
| part number        = MC14500B
+
| part number        = MC14500BCL
 +
| part number 2      = MC14500BAL
 +
| part number 3      = MC14500BCP
 
| market              = Industrial
 
| market              = Industrial
 
| first announced    = 1976
 
| first announced    = 1976
 
| first launched      = 1976
 
| first launched      = 1976
  
 +
| family              = MC14500
 
| frequency          = 1 MHz
 
| frequency          = 1 MHz
  
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| electrical          = yes
 
| electrical          = yes
 
| power              = 500 mW
 
| power              = 500 mW
−
| temp max           = 125 °C
+
| v core              = 5 V
−
| temp min           = -55 °C
+
| v core tolerance    = 5 %
 +
| tjunc min          =
 +
| tjunc max           =
 +
| tcase min          = -55 °C
 +
| tcase max          = 125 °C
 +
| tstorage min       = -65 °C
 +
| tstorage max        = 150 °C
  
 
| packaging          = Yes
 
| packaging          = Yes
Line 28: Line 38:
 
| package type 2      = CerDIP
 
| package type 2      = CerDIP
 
}}
 
}}
−
The '''Motorola MC14500B''' or '''Industrial Control Unit''' ('''ICU''') is a {{arch|1}} [[microprocessor]] designed by [[Motorola]] and released in 1976. Production continued well into the 1990s. The MC14500B was designed as an extremely low cost [[programmable logic controller]] suited for implementing various [[ladder logic]] circuits as replacement for older relay-based systems.
+
The '''MC14500B''' or '''Industrial Control Unit''' ('''ICU''') is a {{arch|1}} [[microprocessor]] designed by [[Motorola]] and released in [[1976]]. Production continued well into the 1990s. The MC14500B was designed as an extremely low cost [[programmable logic controller]] (PLC) suited for implementing various ladder logic circuits as replacement for older relay-based systems.
  
 
== Architecture ==
 
== Architecture ==
−
The MC14500B is a true {{arch|1}} microprocessor - all operations are done on single-bit operands. The MC14500B comes with an internal clock that may be controlled via an external resistor. While designed to run at 1 MHz, it may be tuned down to 10 KHz or hooked up to an external clock altogether.
+
{{main|motorola/mc14500#Architecture|l1=MC14500 Architecture}}
 +
The MC14500B had a single 1-bit register to hold the result and supported {{motorola|mc14500/isa|16 different operations}}.
  
−
The MC14500B does not include any on-chip memory nor a [[program counter]]. A program counter is not provided because this MPU has no notion of memory at all, and by extension no notion of addresses. It implements an early [[Harvard architecture]] type of flow where separate instruction lines and data lines are fed to it. Individual instructions and values are fed in each clock cycle and the result can be read via a number of output lines. Typically a [[PROM]] chip such as the {{motorola|MCM7641}} and PC such as the {{motorola|MC145168}} were used to form a complete system. Because this was done externally, in theory at least, this MPU can support any amount of memory needed.
+
=== Features ===
 +
The MC14500B Industrial Control Unit (ICU) is a single-­bit [[CMOS]] processor. The ICU is designed for use in systems requiring decisions based on successive single-­bit information. An external [[ROM]] stores the control program. With a program counter (and output latches and input multiplexers, if required) the ICU in a system forms a stored­ program controller that replaces combinatorial logic. Applications include relay logic processing, serial data manipulation and control. The ICU also may control an [[MPU]] or be controlled by an MPU.
  
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The MC14500B has a number of output lines to help facilitate [[subroutine]] returns, [[branching]], [[conditional]], and general purpose I/O. However since there are no built-in support for memory or addressing, they have to be dealt with externally, possibly with some glue chips.
+
== Packaging ==
−
 
+
The MC14500B came in a few different packages for different specifications.
−
=== Registers ===
 
−
The MC14500B has a single [[register]]: '''result register''' ('''RR''') which always stores the value of the intimidate operation that has been performed. RR can be read directly from pin 15 at any time. RR is also always used as the 2nd operand to any binary ALU operation.
 
−
 
 
−
=== Instruction Set ===
 
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
! Mnemonic !! OPCode !! Action
+
! Part !! Temperature range
−
|-
 
−
| NOPO || 0x0 || RR → RR ; Flag O → 1
 
−
|-
 
−
| LD ||  0x1 || Data → RR
 
−
|-
 
−
| LDC ||  0x2 || <span style="text-decoration:overline">Data</span> → RR
 
−
|-
 
−
| AND ||  0x3 || RR · Data → RR
 
−
|-
 
−
| ANDC ||  0x4 || RR · <span style="text-decoration:overline">Data</span> → RR
 
 
|-
 
|-
−
| OR || 0x5 || RR + Data → RR
+
| MC14500BCL || Military
 
|-
 
|-
−
| ORC || 0x6 || RR + <span style="text-decoration:overline">Data</span> → RR
+
| MC14500BAL || Industrial
 
|-
 
|-
−
| XNOR || 0x7 || If RR = Data, RR → 1
+
| MC14500BCP || Industrial
 
|-
 
|-
−
| STO || 0x8 || RR → Data ; Write → 1
+
| MC14500BDW || Industrial
−
|-
 
−
| STOC ||  0x9 || <span style="text-decoration:overline">RR</span> → Data ; Write → 1
 
−
|-
 
−
| IEN ||  0xA || Data → IEN
 
−
|-
 
−
| OEN ||  0xB || Data → OEN
 
−
|-
 
−
| JMP || 0xC || JMP Flag → 1
 
−
|-
 
−
| RTN ||  0xD || RTN Flag → 1
 
−
|-
 
−
| SKZ ||  0xE || Skip next instruction if RR = 0
 
−
|-
 
−
| NOPF ||  0xF || RR → RR ; Flag F → 1
 
 
|}
 
|}
 +
*Ceramic "L" packages
 +
*Plastic "P & D/DW" packages
  
 
== Documents ==
 
== Documents ==
 
* [[:File:MC14500B datasheet.pdf|MC14500B Datasheet]]
 
* [[:File:MC14500B datasheet.pdf|MC14500B Datasheet]]
 
* [[:File:Motorola MC14500B Industial Control Unit Handbook.pdf|Motorola MC14500B Industial Control Unit Handbook]]
 
* [[:File:Motorola MC14500B Industial Control Unit Handbook.pdf|Motorola MC14500B Industial Control Unit Handbook]]
 +
 +
== See also ==
 +
* {{motorola|MC14500|MC14500 Family}}

Latest revision as of 14:42, 7 December 2025

Edit Values
Motorola MC14500B
MC14500BCP.jpg
1-bit MC14500BCP
General Info
DesignerMotorola
ManufacturerMotorola
Model NumberMC14500B
Part NumberMC14500BCL,
MC14500BAL,
MC14500BCP
MarketIndustrial
Introduction1976 (announced)
1976 (launched)
General Specs
FamilyMC14500
Frequency1 MHz
Microarchitecture
TechnologyCMOS
Word Size1 bit
Electrical
Power dissipation500 mW
Vcore5 V ± 5 %
Tcase-55 °C – 125 °C
Tstorage-65 °C – 150 °C

The MC14500B or Industrial Control Unit (ICU) is a 1-bit microprocessor designed by Motorola and released in 1976. Production continued well into the 1990s. The MC14500B was designed as an extremely low cost programmable logic controller (PLC) suited for implementing various ladder logic circuits as replacement for older relay-based systems.

Architecture[edit]

Main article: MC14500 Architecture

The MC14500B had a single 1-bit register to hold the result and supported 16 different operations.

Features[edit]

The MC14500B Industrial Control Unit (ICU) is a single-­bit CMOS processor. The ICU is designed for use in systems requiring decisions based on successive single-­bit information. An external ROM stores the control program. With a program counter (and output latches and input multiplexers, if required) the ICU in a system forms a stored­ program controller that replaces combinatorial logic. Applications include relay logic processing, serial data manipulation and control. The ICU also may control an MPU or be controlled by an MPU.

Packaging[edit]

The MC14500B came in a few different packages for different specifications.

Part Temperature range
MC14500BCL Military
MC14500BAL Industrial
MC14500BCP Industrial
MC14500BDW Industrial
  • Ceramic "L" packages
  • Plastic "P & D/DW" packages

Documents[edit]

See also[edit]

Retrieved from "https://en.wikichip.org/w/index.php?title=motorola/mc14500/mc14500b&oldid=104056"
Facts about "MC14500B - Motorola"
RDF feed
base frequency1 MHz (0.001 GHz, 1,000 kHz) +
core voltage5 V (50 dV, 500 cV, 5,000 mV) +
core voltage tolerance5 % +
designerMotorola +
familyMC14500 +
first announced1976 +
first launched1976 +
full page namemotorola/mc14500/mc14500b +
instance ofmicroprocessor +
ldate1976 +
main imageFile:MC14500BCP.jpg +
main image caption1-bit MC14500BCP +
manufacturerMotorola +
market segmentIndustrial +
max case temperature398.15 K (125 °C, 257 °F, 716.67 °R) +
max storage temperature423.15 K (150 °C, 302 °F, 761.67 °R) +
min case temperature218.15 K (-55 °C, -67 °F, 392.67 °R) +
min storage temperature208.15 K (-65 °C, -85 °F, 374.67 °R) +
model numberMC14500B +
nameMotorola MC14500B +
part numberMC14500BCL +, MC14500BAL + and MC14500BCP +
power dissipation0.5 W (500 mW, 6.705e-4 hp, 5.0e-4 kW) +
technologyCMOS +
word size1 bit (0.125 octets, 0.25 nibbles) +