Description
PIC18LF2320 offers the advantages of all PIC18 microcontrollers ñ namely, high computational performance at an economical price with the addition of highendurance Enhanced Flash program memory. On top of these features, the PIC18F2220/2320/4220/4320 family introduces design enhancements that make these microcontrollers a logical choice for many high-performance, power sensitive applications. All of the devices in the PIC18F2220/2320/4220/4320 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 oscillator block, 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 are still active. In these states, power consumption can be reduced even further, to as little as 4%, of normal operation requirements. On-the-Fly Mode Switching: The power-managed modes are invoked by user code during operation, allowing the user to incorporate power-saving ideas into their applicationís software design. Lower Consumption in Key Modules: The power requirements for both Timer1 and the Watchdog Timer have been reduced by up to 80%, with typical values of 1.8 and 2.2 µA, respectively. All of the devices in the PIC18F2220/2320/4220/4320 family offer nine 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 Two 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 Two External RC Oscillator modes with the same pin options as the External Clock modes. ï An internal oscillator block, which provides a 31 kHz INTRC clock and an 8 MHz clock with 6 program selectable divider ratios (4 MHz to 125 kHz) for a total of 8 clock frequencies Besides its availability as a clock source, the internal oscillator block 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 block, 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. This allows for code execution during what would otherwise be the clock start-up interval and can even allow an application to perform routine background activities and return to Sleep without returning to full power operation. Memory Endurance: The Enhanced Flash cells for both program memory and data EEPROM are rated to last for many thousands of erase/write cycles ñ up to 100,000 for program memory and 1,000,000 for EEPROM. Data retention without refresh is conservatively estimated to be greater than 40 years
- Low-Power Features:
- Power-Managed modes:
- Run: CPU on, peripherals on
- Idle: CPU off, peripherals on
- Sleep: CPU off, peripherals off
- Power Consumption modes:
- PRI_RUN: 150 µA, 1 MHz, 2V
- PRI_IDLE: 37 µA, 1 MHz, 2V
- SEC_RUN: 14 µA, 32 kHz, 2V
- SEC_IDLE: 5.8 µA, 32 kHz, 2V
- RC_RUN: 110 µA, 1 MHz, 2V
- RC_IDLE: 52 µA, 1 MHz, 2V
- Sleep: 0.1 µA, 1 MHz, 2V
- Timer1 Oscillator: 1.1 µA, 32 kHz, 2V
- Watchdog Timer: 2.1 µA
- Two-Speed Oscillator Start-up Oscillators:
- Four Crystal modes:
- LP, XT, HS: up to 25 MHz
- HSPLL: 4-10 MHz (16-40 MHz internal)
- Two External RC modes, Up to 4 MHz
- Two External Clock modes, Up to 40 MHz
- Internal Oscillator Block:
- 8 user-selectable frequencies: 31 kHz, 125 kHz, 250 kHz, 500 kHz, 1 MHz, 2 MHz, 4 MHz, 8 MHz
- 125 kHz-8 MHz calibrated to 1%
- Two modes select one or two I/O pins
- OSCTUNE Allows user to shift frequency
- Secondary Oscillator using Timer1 @ 32 kHz
- Fail-Safe Clock Monitor
- Allows for safe shutdown if peripheral clock stops
- Peripheral Highlights:
- High-Current Sink/Source 25 mA/25 mA
- Three External Interrupts
- Up to 2 Capture/Compare/PWM (CCP) modules:
- Capture is 16-bit, max. resolution is 6.25 ns (TCY/16)
- Compare is 16-bit, max. resolution is 100 ns (TCY)
- PWM output: PWM resolution is 1 to 10-bit
- Enhanced Capture/Compare/PWM (ECCP) module:
- One, two or four PWM outputs
- Selectable polarity
- Programmable dead time
- Auto-Shutdown and Auto-Restart
- Compatible 10-Bit, Up to 13-Channel Analog-to-Digital Converter (A/D) module with Programmable Acquisition Time
- Dual Analog Comparators
- Addressable USART module:
- RS-232 operation using internal oscillator block (no external crystal required) Special Microcontroller Features:
- 100,000 Erase/Write Cycle Enhanced Flash Program Memory Typical
- 1,000,000 Erase/Write Cycle Data EEPROM Memory Typical
- Flash/Data EEPROM 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 41 ms to 131s
- 2% stability over VDD and Temperature
- Single-Supply 5V In-Circuit Serial Programmingô (ICSPô) via Two Pins
- In-Circuit Debug (ICD) via Two Pins
- Wide Operating Voltage Range: 2.0V to 5.5V
