| 型号/特性 | 80C51FA | 83C51FA | 87C51FA | 83C51FB | 87C51FB | 83C51FC | 87C51FC |
| ROM/EPROM (bytes) |
ROMless | 8kROM | 8kEPROM | 16kROM | 16kEPROM | 32kROM | 32kEPROM |
| 数据存储器 | 256 | 256 | 256 | 256 | 256 | 256 | 256 |
| 工作频率(MHz) | 12/16 | 12/16 | 12/16/20/24 | 12/16/20/24 | 12/16/20/24 | 12/16/20/24 | 12/16/20/24 |
| I/O口 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| 定时计数器 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| UART | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 中断源 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| PCA通道 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| A/D转换通道 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| DMA通道 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 加密锁 | - | 0 | 3 | 1 | 3 | 1 | 3 |
| 空闲和 掉电模式 |
yes | yes | yes | yes | yes | yes | yes |
