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| Lead Time | 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks |
| Flash | 64K , 64K , 64K , 64K , 64K |
| SRAM | 256+1K , 256+1K , 256+1K , 256+1K , 256+1K |
| LDROM | 2.5K , 2.5K , 2.5K , 2.5K , 2.5K |
| I/O | 40 , 40 , 40 , 40 , 40 |
| Timer | 3*16-bit , 3*16-bit , 3*16-bit , 3*16-bit , 3*16-bit |
| UART | 1 , 1 , 1 , 1 , 1 |
| SPI | 1 , 1 , 1 , 1 , 1 |
| PWM | 5*8-bit , 5*8-bit , 5*8-bit , 5*8-bit , 5*8-bit |
| ISP/ICP/IAP | Yes , Yes , Yes , Yes , Yes |
| Package | PDIP40/PLCC44/PQFP44/LQFP48 , PDIP40/PLCC44/PQFP44/LQFP48 , PDIP40/PLCC44/PQFP44/LQFP48 , PDIP40/PLCC44/PQFP44/LQFP48 , PDIP40/PLCC44/PQFP44/LQFP48 |
| Status | Mass Production , Mass Production , Mass Production , Mass Production , Mass Production |
| INT | 4 , 4 , 4 , 4 , 4 |
| Special Function | 6T/12T option， Extra I/O port， internal 22 MHz RC，4 level BOR , 6T/12T option， Extra I/O port， internal 22 MHz RC，4 level BOR , 6T/12T option， Extra I/O port， internal 22 MHz RC，4 level BOR , 6T/12T option， Extra I/O port， internal 22 MHz RC，4 level BOR , 6T/12T option， Extra I/O port， internal 22 MHz RC，4 level BOR |
The Nuvoton standard 8051 series is pin-compatible with traditional 12T 8051 and operating at 2.4V ~ 5.5V and - 40 ℃ ~ 85 ℃.
