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| Lead Time | 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks |
| Flash | 32K , 32K , 32K , 32K , 32K |
| SRAM | 8K , 8K , 8K , 8K , 8K |
| Data Flash | Configurable , Configurable , Configurable , Configurable , Configurable |
| LDROM | 4.5K , 4.5K , 4.5K , 4.5K , 4.5K |
| I/O | 22 , 22 , 22 , 22 , 22 |
| Timer | 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit |
| UART | 1 , 1 , 1 , 1 , 1 |
| SPI | 1 , 1 , 1 , 1 , 1 |
| I2C | 2 , 2 , 2 , 2 , 2 |
| PWM | 17 , 17 , 17 , 17 , 17 |
| ADC | 4*12-bit , 4*12-bit , 4*12-bit , 4*12-bit , 4*12-bit |
| Package | QFN33 , QFN33 , QFN33 , QFN33 , QFN33 |
| Status | Mass Production , Mass Production , Mass Production , Mass Production , Mass Production |
| ISP /ICP /IAP | Yes , Yes , Yes , Yes , Yes |
| Operating Temp. Range (°C ) | -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 |
| IRC | 10kHz， 48MHz , 10kHz， 48MHz , 10kHz， 48MHz , 10kHz， 48MHz , 10kHz， 48MHz |
| USB | 1 , 1 , 1 , 1 , 1 |
| I2S/ AC97 | 1 , 1 , 1 , 1 , 1 |
| PDMA | 5 , 5 , 5 , 5 , 5 |
The NuMicro® NUC121/125 series is a 32-bit microcontroller ( MCU ) with ARM® Cortex®-M0 core.
