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| Lead Time | 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks |
| Flash | 64 , 64 , 64 , 64 , 64 |
| SRAM | 8 , 8 , 8 , 8 , 8 |
| Data Flash | Configurable , Configurable , Configurable , Configurable , Configurable |
| LDROM | 4K , 4K , 4K , 4K , 4K |
| I/O | 54 , 54 , 54 , 54 , 54 |
| Timer | 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit |
| UART | 3 , 3 , 3 , 3 , 3 |
| I2C | 1 , 1 , 1 , 1 , 1 |
| PWM | 6 , 6 , 6 , 6 , 6 |
| ADC | 16 , 16 , 16 , 16 , 16 |
| ISP/ICP/IAP | Yes , Yes , Yes , Yes , Yes |
| Package | LQFP64 , LQFP64 , LQFP64 , LQFP64 , LQFP64 |
| Status | Mass Production , Mass Production , Mass Production , Mass Production , Mass Production |
| Comparator | 2 , 2 , 2 , 2 , 2 |
| RTC | Y , Y , Y , Y , Y |
| ISO-7816-3 | 1 , 1 , 1 , 1 , 1 |
| Operating Temp. Range (°C ) | -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 |
| PDMA | 5 , 5 , 5 , 5 , 5 |
| SPI / I2S | 1 , 1 , 1 , 1 , 1 |
| Touch Key | 14 , 14 , 14 , 14 , 14 |
| Tamper Detect (pin) | 1 , 1 , 1 , 1 , 1 |
The NuMicro M254/M256/M258 series 32-bit low-power microcontroller is based on Arm Cortex-M23 core.
