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| SRAM | 8K |
| Data Flash | Configurable |
| LDROM | 4.5K |
| I/O | 37 |
| Timer | 4*32-bit |
| UART | 1 |
| SPI | 1 |
| I2C | 2 |
| PWM | 23 |
| ADC | 10*12-bit |
| Status | Mass Production |
| ISP /ICP /IAP | Yes |
| Operating Temp. Range (°C ) | -40 to +105 |
| IRC | 10kHz， 48MHz |
| USB | 1 |
| I2S/ AC97 | 1 |
| PDMA | 5 |
The NuMicro® NUC121/125 series is a 32-bit microcontroller ( MCU ) with ARM® Cortex®-M0 core.
