Semiconductor & Computer Engineering
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==Lines== | ==Lines== | ||
===μCOM-42=== | ===μCOM-42=== | ||
| − | The '''μCOM-42''' (also referred to as '''{{nec| | + | The '''μCOM-42''' (also referred to as '''{{nec|μPD548}}''') was specifically marketed for [[electronic cash register]]s (ECRs), [[Point of Sale]] (POS), and [[electronic scale]] applications. The μCOM-42 chips were specifically designed for controlling 8x4 keyboards, 8-digit displays, and various ECR-type printers. |
The single-chip had single-byte 72 instructions with a 10[[µsec]] instruction cycle. The chip included 1920x10-bit [[program memory]], 96x4-bit [[data memory]], 4-level [[hardware stack|stack]], 2 [[interrupt request|interrupt request lines]], and various I/O ports. | The single-chip had single-byte 72 instructions with a 10[[µsec]] instruction cycle. The chip included 1920x10-bit [[program memory]], 96x4-bit [[data memory]], 4-level [[hardware stack|stack]], 2 [[interrupt request|interrupt request lines]], and various I/O ports. | ||
===μCOM-43=== | ===μCOM-43=== | ||
| − | The '''μCOM-43''' (also referred to as '''{{nec| | + | The '''μCOM-43''' (also referred to as '''{{nec|μPD546}}''') was marketed as a general-purpose microcontroller suited for a large array of low-cost consumer and industrial applications. |
The single-chip had 80 general instructions with a 10[[µsec]] instruction cycle. The chip included 2000x8-bit [[program memory]], 96x4-bit [[data memory]], 3-level [[hardware stack|stack]], various [[interrupt request|interrupt request lines]] and 35 I/O ports. | The single-chip had 80 general instructions with a 10[[µsec]] instruction cycle. The chip included 2000x8-bit [[program memory]], 96x4-bit [[data memory]], 3-level [[hardware stack|stack]], various [[interrupt request|interrupt request lines]] and 35 I/O ports. | ||
===μCOM-44=== | ===μCOM-44=== | ||
| − | The '''μCOM-44''' (also referred to as '''{{nec| | + | The '''μCOM-44''' (also referred to as '''{{nec|μPD547}}''') was marketed as a low cost general-purpose microcontroller suited specifically well for various controllers due to its large amount of I/O ports, similar to the μCOM-43. |
The single-chip had a reduced 58 general instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 1000x8-bit, reduced [[data memory]] of 64x4-bit, a single-level [[hardware stack|stack]], but a large set of 35 I/O ports. | The single-chip had a reduced 58 general instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 1000x8-bit, reduced [[data memory]] of 64x4-bit, a single-level [[hardware stack|stack]], but a large set of 35 I/O ports. | ||
===μCOM-45=== | ===μCOM-45=== | ||
| − | The '''μCOM-45''' (also referred to as '''{{nec| | + | The '''μCOM-45''' (also referred to as '''{{nec|μPD550}}''') was the low-end, ultra low cost general-purpose microcontroller suitable for mass-produced extremely low cost consumer products. |
Like the μCOM-44, the μCOM-45 had a reduced instruction set of 58 instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 640x8-bit, reduced [[data memory]] of 32x4-bit, a single-level [[hardware stack|stack]], and only 21 I/O ports. | Like the μCOM-44, the μCOM-45 had a reduced instruction set of 58 instructions with a 10[[µsec]] instruction cycle. The chip included a reduced [[program memory]] of 640x8-bit, reduced [[data memory]] of 32x4-bit, a single-level [[hardware stack|stack]], and only 21 I/O ports. | ||
Revision as of 17:33, 4 November 2015
The μCOM-4 line is a family of 4-bit microcontrollers developed by NEC in the late 1970s. This family was designed to be low-cost, mass-produced, microcontrollers for ECRs, industrial controllers, appliance controllers, games, toys, scientific calculators, and other consumer electronics. The μCOM-4 line were the first Japanese single-chip microprocessor.
Introduction Date
| 1977 | 1980 | ||||||
|---|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 |
| μCOM-42 | μCOM-43 | μCOM-44 | μCOM-45 | μCOM-75 | |||
Lines
μCOM-42
The μCOM-42 (also referred to as μPD548) was specifically marketed for electronic cash registers (ECRs), Point of Sale (POS), and electronic scale applications. The μCOM-42 chips were specifically designed for controlling 8x4 keyboards, 8-digit displays, and various ECR-type printers.
The single-chip had single-byte 72 instructions with a 10µsec instruction cycle. The chip included 1920x10-bit program memory, 96x4-bit data memory, 4-level stack, 2 interrupt request lines, and various I/O ports.
μCOM-43
The μCOM-43 (also referred to as μPD546) was marketed as a general-purpose microcontroller suited for a large array of low-cost consumer and industrial applications.
The single-chip had 80 general instructions with a 10µsec instruction cycle. The chip included 2000x8-bit program memory, 96x4-bit data memory, 3-level stack, various interrupt request lines and 35 I/O ports.
μCOM-44
The μCOM-44 (also referred to as μPD547) was marketed as a low cost general-purpose microcontroller suited specifically well for various controllers due to its large amount of I/O ports, similar to the μCOM-43.
The single-chip had a reduced 58 general instructions with a 10µsec instruction cycle. The chip included a reduced program memory of 1000x8-bit, reduced data memory of 64x4-bit, a single-level stack, but a large set of 35 I/O ports.
μCOM-45
The μCOM-45 (also referred to as μPD550) was the low-end, ultra low cost general-purpose microcontroller suitable for mass-produced extremely low cost consumer products.
Like the μCOM-44, the μCOM-45 had a reduced instruction set of 58 instructions with a 10µsec instruction cycle. The chip included a reduced program memory of 640x8-bit, reduced data memory of 32x4-bit, a single-level stack, and only 21 I/O ports.
μCOM-75
The μCOM-75 series were introduced in early 1980 made in CMOS technology and had comparable features to the previous μCOM-4 product line.
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