Brief History of 8051 Microcontroller
- In 1976, Intel Corporation introduced an 8-bit microcontroller under the name MCS-48. Later they released an improved version under the name MCS-51.
- In 1981, Intel Corporation introduced an 8-bit microcontroller called 8051.
- The 8051 is a Harvard architecture, CISC instruction set, single chip microcontroller (µC).
- 8051 belongs to the MCS-51 family of microcontrollers by Intel.
- 8051 had processor – 8 bit, RAM – 128 bytes, ROM – 4K, timer – 2, serial port – 1, IO port – 4 (4*8 = 32 IO pins), interrupt source – 6.
- It was referred as system on chip.
- Intel allowed other manufactures to make and market any flavor of 8051 with condition that they remain code compatible with original 8051.
- There are different flavors of 8051 in terms of speed, ROM, RAM, timer and interrupt.
- 8052 and 8031 are the two other members of 8051 family of microcontrollers.
- Comparison of 8051 family microcontrollers.
- 8051 can have a maximum of 64K bytes of on-chip ROM.
- External ROM, as large as 64K bytes must be attached to 8031 through IO ports.
- External IO can be attached to 8031.
- There are various versions of 8051 such as, EPROM version, Flash version, NVRAM version, OTP (one time programmable) version.
- All the versions of 8051 microcontrollers can be programmed using 8051 instruction set.
| Feature | 8051 | 8052 | 8031 |
|---|---|---|---|
| ROM on-chip | 4K | 8K | 0K |
| RAM | 128 | 256 | 128 |
| Timer | 2 | 3 | 2 |
| IO port | 4 | 4 | 4 |
| Serial port | 1 | 1 | 1 |
| Interrupt source | 6 | 8 | 6 |
Related topics:
8051 Features | 8051 Pin Diagram | 8051 Architecture | 8051 Memory Types | 8051 Memory Map
List of topics: 8051
No comments:
Post a Comment