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| SRAM | 32 |
| Data Flash | Configurable |
| LDROM | 4K |
| I/O | 86 |
| Timer | 4*32-bit |
| UART | 4 |
| I2C | 2 |
| PWM | 12*16-bit |
| ADC | 16 |
| ISP/ICP/IAP | Yes |
| Comparator | 2 |
| RTC | Y(VBAT) |
| ISO-7816-3 | 1 |
| DAC | 2 |
| Operating Temp. Range (°C ) | -40 to +105 |
| PDMA | 8 |
| EBI | Yes |
| SPI / I2S | 2 |
| Tamper Detect (pin) | 1 |
| DES/ 3-DES / AES | Y |
The NuMicro M254/M256/M258 series 32-bit low-power microcontroller is based on Arm Cortex-M23 core.


