Description
PIC18LF4450 offers the advantages of all PIC18 microcontrollers ñ namely, high computational performance at an economical price ñ with the addition of high-endurance, Enhanced Flash program memory. In addition to these features, the PIC18F2450/4450 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power sensitive applications. All of the devices in the PIC18F2450/4450 family incorporate a range of features that can significantly reduce power consumption during operation. Alternate Run Modes: By clocking the controller from the Timer1 source or the internal RC oscillator, power consumption during code execution can be reduced by as much as 90%. Multiple Idle Modes: The controller can also run with its CPU core disabled but the peripherals still active. In these states, power consumption can be reduced even further, to as little as 4% of normal operation requirements. ï On-the-Fly Mode Switching: The powermanaged modes are invoked by user code during operation, allowing the user to incorporate power-saving ideas into their applicationís software design. Low Consumption in Key Modules: The power requirements for both Timer1 and the Watchdog Timer are minimized Devices in the PIC18F2450/4450 family incorporate a fully featured Universal Serial Bus communications module that is compliant with the USB Specification Revision 2.0. The module supports both low-speed and full-speed communication for all supported data transfer types. It also incorporates its own on-chip transceiver and 3.3V regulator and supports the use of external transceivers and voltage regulators. All of the devices in the PIC18F2450/4450 family offer twelve different oscillator options, allowing users a wide range of choices in developing application hardware. These include: ï Four Crystal modes using crystals or ceramic resonators. ï Four External Clock modes, offering the option of using two pins (oscillator input and a divide-by-4 clock output) or one pin (oscillator input, with the second pin reassigned as general I/O). ï An INTRC source (approximately 31 kHz, stable over temperature and VDD). This option frees an oscillator pin for use as an additional general purpose I/O. ï A Phase Lock Loop (PLL) frequency multiplier, available to both the High-Speed Crystal and External Oscillator modes, which allows a wide range of clock speeds from 4 MHz to 48 MHz. ï Asynchronous dual clock operation, allowing the USB module to run from a high-frequency oscillator while the rest of the microcontroller is clocked from an internal low-power oscillator. The internal oscillator provides a stable reference source that gives the family additional features for robust operation: Fail-Safe Clock Monitor: This option constantly monitors the main clock source against a reference signal provided by the internal oscillator. If a clock failure occurs, the controller is switched to the internal oscillator, allowing for continued low-speed operation or a safe application shutdown. Two-Speed Start-up: This option allows the internal oscillator to serve as the clock source from Power-on Reset, or wake-up from Sleep mode, until the primary clock source is available
- 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 Programmingô (ICSPô) 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)
