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| SRAM | 32K |
| Data Flash | Configurable |
| LDROM | 4K |
| I/O | 49 |
| Timer | 4*32-bit |
| UART | 4 |
| SPI | 2 |
| I2C | 2 |
| PWM | 12*16-bit |
| ADC | 16 |
| ISP/ICP/IAP | Yes |
| Status | Mass Production |
| RTC | Y(Vbat) |
| ISO-7816-3 | 1 |
| PDMA | 8 |
| EBI | Yes |
| USB Device | FS |
| Voltage Adjustable Interface | Y |
| USB Host | FS |
| Tamper Detect (pin) | 1 |
| Operating Temp. Range (¢FXC ) | -40 to +105 |
The NuMicro® M4521 USB series 32-bit microcontroller ( MCU ) is embedded with the ARM® Cortex®-M4 core.
