規格
| 屬性 | 價值 |
| Supplier | NXP USA Inc. |
| Package / Case | Tray |
| Series | M680x0 |
| Part Status | Obsolete |
| Core Processor | 68020 |
| Number of Cores / Bus Width | 1 Core, 32-Bit |
| Speed | 20MHz |
| Graphics Acceleration | No |
| Voltage - I / O | 5.0V |
| Operating Temperature | 0°C ~ 70°C (TA) |
概述
Description
MC68020RC20E is Motorola’s 68020 32‑bit microprocessor, a second‑generation member of the 68k family. It is a 32‑bit CISC CPU with a 32‑bit data bus, 32‑bit internal registers, and 32‑bit addressing (up to 4 GB). It offers an enhanced instruction set with more flexible addressing modes and a prefetch-based pipeline to improve throughput. The chip can be paired with an external MMU (68051/68851) for virtual memory and with an optional floating‑point unit (68881/68882). The RC20E suffix denotes a specific production/packaging variant (temperature grade) of the part; exact specs (speed, package, etc.) should be checked in the datasheet. This CPU saw use in early Macintosh II systems, Amiga platforms, and various embedded/workstation applications in the late 1980s and early 1990s.
Features
Key features of MC68020RC20E (Motorola 68020 family):
- 32-bit core: 32-bit data path, 32-bit registers (D0–D7, A0–A7), and 32-bit address space (up to 4 GB).
- Enhanced execution: pipelined with instruction prefetch and support for long-word operations; richer addressing modes than 68000.
- Memory management: optional external MMU via 68851 for virtual memory, paging, and memory protection.
- Floating-point: no internal FPU; can use external 68881/68882 if required.
- Bus: 32-bit external data and address bus for higher memory bandwidth.
- Compatibility: binary compatible with 68000 software; adds many new instructions and modes.
- Variants: RC20E denotes a specific revision/speed grade within the 68020 family (MHz varies by part).
Notes: No on-chip caches in this model (caches appear with later 68030/68040 variants).
- 32-bit core: 32-bit data path, 32-bit registers (D0–D7, A0–A7), and 32-bit address space (up to 4 GB).
- Enhanced execution: pipelined with instruction prefetch and support for long-word operations; richer addressing modes than 68000.
- Memory management: optional external MMU via 68851 for virtual memory, paging, and memory protection.
- Floating-point: no internal FPU; can use external 68881/68882 if required.
- Bus: 32-bit external data and address bus for higher memory bandwidth.
- Compatibility: binary compatible with 68000 software; adds many new instructions and modes.
- Variants: RC20E denotes a specific revision/speed grade within the 68020 family (MHz varies by part).
Notes: No on-chip caches in this model (caches appear with later 68030/68040 variants).
Pinout
- Pin count: 132 pins (in the MC68020RC20E package)
- Function: Motorola 68020 32-bit CISC microprocessor (68k family) with a 32-bit data and 32-bit address bus, capable of running 68000-compatible instructions with enhanced performance; typically used with an external MMU (68851) and supports supervisor/user modes.
- Function: Motorola 68020 32-bit CISC microprocessor (68k family) with a 32-bit data and 32-bit address bus, capable of running 68000-compatible instructions with enhanced performance; typically used with an external MMU (68851) and supports supervisor/user modes.
Manufacturer
- Manufacturer: Motorola, Inc. (Motorola Semiconductor)
- What kind of company: An American multinational electronics and telecommunications company that designs and manufactures semiconductors and related technologies (its semiconductor unit became Freescale in 2004 and is now part of NXP).
- What kind of company: An American multinational electronics and telecommunications company that designs and manufactures semiconductors and related technologies (its semiconductor unit became Freescale in 2004 and is now part of NXP).
Application
Main application areas:
- Industrial automation and embedded controllers
- Automotive ECUs and chassis electronics
- Telecommunications and network equipment
- Aerospace/defense avionics and space hardware
- Medical devices and instrumentation
- Real-time control, robotics, CNC, PLC systems
- Multimedia, graphics and high-performance embedded systems
- Data acquisition and scientific instrumentation
- Industrial automation and embedded controllers
- Automotive ECUs and chassis electronics
- Telecommunications and network equipment
- Aerospace/defense avionics and space hardware
- Medical devices and instrumentation
- Real-time control, robotics, CNC, PLC systems
- Multimedia, graphics and high-performance embedded systems
- Data acquisition and scientific instrumentation
Package
Ceramic package: 208-pin ceramic PGA variant (not a plastic DIP).
