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MCS-51 (8051) information |
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The MCS-51 Family, introduced in 1980, includes 2 timers and 4 ports as well as 128bytes or more
of on board RAM. The 51 is one of the most popular MCUs on the market. It is now
being made in speeds of up to 100MHz by SiLabs, while Intel continues to make
them up to 33MHz.
The standard MCS-51 instruction set has 111 instructions with 64 of them
executing in a single cycle. They can support up to 64k of external prgram, and
54k of external memory space.
The MCS-51 family is now made by dozens of companies, with many different
features. There are over 1000 versions of the 8051 core.
The Intel 8xC251TB/TQ and 8xC251SA/SB/SP/SQ are based on the new high
performance MCS 251 micro-controller architecture. Being members of the MCS 251
microcontroller family, the 8xC251TB/TQ and 8xC251SA/SB/SP/SQ have the same
advanced register based CPU architecture and a pipelined instruction execution
unit. They use the powerful MCS 251 microcontroller instruction set, with many
enhanced 8, 16 and 32-bit instructions available. The new microcontrollers are
also specially designed to execute C code efficiently. Most importantly, the
8xC251TB/TQ and 8xC251SA/SB/SP/SQ are binary code and pin compatible with the
existing MCS 51 microcontrollers. They represent the easiest way to upgrade
performance of existing MCS 51 microcontroller applications, delivering up to 15
times the performance.
| Device |
RAM (bytes) |
ROM (bytes) |
Speed |
Timers |
Ports |
| 8031 |
128 |
- |
12MHz |
2 |
4x8 |
| 8032 |
256 |
- |
12MHz |
2 |
4x8 |
| 8044* |
192 |
4096 |
12MHz |
2 |
4x8 |
| 8051 |
128 |
4096 |
12MHz |
2 |
4x8 |
| 8052 |
256 |
8192 |
24MHz |
2 |
4x8 |
| 8054 |
256 |
16K |
24MHz |
3 |
4x8 |
| 8058 |
256 |
32K |
33MHz |
3 |
4x8 |
| MCS-251 |
| 8x251SA |
1k |
8k |
16MHz |
3 |
32 |
| 8x251SB |
1k |
16k |
16MHz |
3 |
32 |
| 8x251SP |
512 |
8k |
16MHz |
3 |
32 |
| 8x251SQ |
512 |
16k |
16MHz |
3 |
32 |
| 8x251TB |
1K |
16k |
24MHz |
3 |
32 |
| 8251TQ |
512 |
- |
24MHz |
3 |
32 |
| USB Equipped MCS-251 |
| 80930Ax |
512-1024 |
- |
12MHz |
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| 83930Ax |
512-1024 |
8-16K |
12MHz |
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* 8044 Includes a high-speed serial interface.
8052 Online Resource: http://www.8052.com/
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