Overview

Devices in the PIC18F2450/4450 family incorporate a different oscillator and microcontroller clock system than the non-USB PIC18F devices. The addition of the USB module, with its unique requirements for a stable clock source, make it necessary to provide a separate clock source that is compliant with both USB low-speed and full-speed specifications.

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)

• 256-Byte Dual Access RAM for USB

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

• Interface for Off-Chip USB Transceiver

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: 1.8 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 31 kHz Oscillator

• 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

• Three Timer modules (Timer0 to Timer2)

• Capture/Compare/PWM (CCP) module:

- Capture is 16-bit, max. resolution 5.2 ns

- Compare is 16-bit, max. resolution 83.3 ns

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

• Enhanced USART module:

- LIN bus support

• 10-Bit, Up to 13-Channel Analog-to-Digital Converter module (A/D):

- Up to 100 ksps sampling rate

- Programmable acquisition time

Special Microcontroller Features:

• C Compiler Optimized Architecture with Optional Extended Instruction Set

• Flash Memory Retention: > 40 Years

• Self-Programmable under Software Control

• Priority Levels for Interrupts

• 8 x 8 Single-Cycle Hardware Multiplier

• Extended Watchdog Timer (WDT):

- Programmable period from 4 ms to 131s

• Programmable Code Protection

• Single-Supply In-Circuit Serial Programming™ (ICSP™) via Two Pins

• In-Circuit Debug (ICD) via Two Pins

• Optional Dedicated ICD/ICSP Port (44-pin TQFP devices only)

• Wide Operating Voltage Range (2.0V to 5.5V)