DEVICE OVERVIEW

This document contains device-specific information for the following devices:



• PIC18F2455 • PIC18LF2455

• PIC18F2550 • PIC18LF2550

• PIC18F4455 • PIC18LF4455

• PIC18F4550 • PIC18LF4550



This family of devices offers the advantages of all PIC18 microcontrollers – namely, high computational performance at an economical price – with the addition of high-endurance, Enhanced Flash program memory. In addition to these features, the PIC18F2455/2550/4455/4550 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power sensitive applications.

Universal Serial Bus Features:

• USB V2.0 Compliant

• Low Speed (1.5 Mb/s) and Full Speed (12 Mb/s)

• Supports Control, Interrupt, Isochronous and Bulk Transfers

• Supports up to 32 Endpoints (16 bidirectional)

• 1 Kbyte Dual Access RAM for USB

• On-Chip USB Transceiver with On-Chip Voltage Regulator

• Interface for Off-Chip USB Transceiver

• Streaming Parallel Port (SPP) for USB streaming transfers (40/44-pin devices only)



Power-Managed Modes:

• Run: CPU on, Peripherals on

• Idle: CPU off, Peripherals on

• Sleep: CPU off, Peripherals off

• Idle mode Currents Down to 5.8 μA Typical

• Sleep mode Currents Down to 0.1 μA Typical

• Timer1 Oscillator: 1.1 μA Typical, 32 kHz, 2V

• Watchdog Timer: 2.1 μA Typical

• Two-Speed Oscillator Start-up



Flexible Oscillator Structure:

• Four Crystal modes, including High-Precision PLL for USB

• Two External Clock modes, Up to 48 MHz

• Internal Oscillator Block:

  - 8 user-selectable frequencies, from 31 kHz to 8 MHz

  - User-tunable to compensate for frequency drift

• Secondary Oscillator using Timer1 @ 32 kHz

• Dual Oscillator Options allow Microcontroller and USB module to Run at Different Clock Speeds

• Fail-Safe Clock Monitor:

  - Allows for safe shutdown if any clock stops

Peripheral Highlights:

• High-Current Sink/Source: 25 mA/25 mA

• Three External Interrupts

• Four Timer modules (Timer0 to Timer3)

• Up to 2 Capture/Compare/PWM (CCP) modules:

  - Capture is 16-bit, max. resolution 5.2 ns (TCY/16)

  - Compare is 16-bit, max. resolution 83.3 ns (TCY)

  - PWM output: PWM resolution is 1 to 10-bit

• Enhanced Capture/Compare/PWM (ECCP) module:

  - Multiple output modes

  - Selectable polarity

  - Programmable dead time

  - Auto-shutdown and auto-restart

• Enhanced USART module:

  - LIN bus support

• Master Synchronous Serial Port (MSSP) module Supporting 3-Wire SPI (all 4 modes) and I2C™ Master and Slave modes

• 10-Bit, Up to 13-Channel Analog-to-Digital Converter (A/D) module with Programmable Acquisition Time

• Dual Analog Comparators with Input Multiplexing