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| Lead Time | 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks , 20 Weeks |
| Flash | 128K , 128K , 128K , 128K , 128K |
| SRAM | 32K , 32K , 32K , 32K , 32K |
| Data Flash | Configurable , Configurable , Configurable , Configurable , Configurable |
| LDROM | 4K , 4K , 4K , 4K , 4K |
| I/O | 49 , 49 , 49 , 49 , 49 |
| Timer | 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit , 4*32-bit |
| UART | 4 , 4 , 4 , 4 , 4 |
| SPI | 2 , 2 , 2 , 2 , 2 |
| I2C | 2 , 2 , 2 , 2 , 2 |
| PWM | 12*16-bit , 12*16-bit , 12*16-bit , 12*16-bit , 12*16-bit |
| 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 |
| RTC | Y(Vbat) , Y(Vbat) , Y(Vbat) , Y(Vbat) , Y(Vbat) |
| ISO-7816-3 | 1 , 1 , 1 , 1 , 1 |
| PDMA | 8 , 8 , 8 , 8 , 8 |
| EBI | Yes , Yes , Yes , Yes , Yes |
| USB Device | FS , FS , FS , FS , FS |
| Voltage Adjustable Interface | Y , Y , Y , Y , Y |
| USB Host | FS , FS , FS , FS , FS |
| Tamper Detect (pin) | 1 , 1 , 1 , 1 , 1 |
| Operating Temp. Range (¢FXC ) | -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 , -40 to +105 |
The NuMicro® M4521 USB series 32-bit microcontroller ( MCU ) is embedded with the ARM® Cortex®-M4 core.
