Specifications:

Core Features:

• Architecture: 8-bit PIC18
• Instruction Set: PIC18 (up to 75 instructions)
• Clock Speed: Up to 48 MHz (with 12 MIPS)
• Operating Voltage: 2.0V to 5.5V
• Power-Saving Modes:
  • Sleep Mode: Ultra-low power
  • Idle Mode

Memory:

• Program Memory (Flash): 32 KB (16K x 16)
• Data RAM: 2 KB
• Data EEPROM: 256 bytes
• Self-programming: Yes (support for bootloader applications)

Peripherals:

• Timers:
  • Timer0: 8-bit/16-bit
  • Timer1: 16-bit
  • Timer2: 8-bit
  • Timer3: 16-bit
• Capture/Compare/PWM: 1 module
• Analog-to-Digital Converter (ADC): 10-bit resolution, up to 13 channels
• Comparators: 2 onboard comparators

I/O and Communication:

• Digital I/O Pins: 24 pins (multiplexed with other peripherals)
• USART (EUSART): Enhanced USART module
• SPI/I2C: 1 MSSP module (Master Synchronous Serial Port for SPI or I2C)
• USB 2.0 Support:
  • Full-Speed USB 2.0 compliance (12 Mbps)
  • Built-in USB transceiver
  • 1 KB USB RAM

Special Features:

• Enhanced Flash Program Memory: Allows for self-write, ideal for bootloaders.
• USB Voltage Regulator: Allows the PIC18F2550 to operate directly from the USB supply.
• In-Circuit Serial Programming (ICSP): Supports programming via a 5-pin connector.
• In-Circuit Debugging (ICD): On-chip debug capability via two pins.

Datasheet