
PIC18F2X1X/4X1X

28/40/44-Pin Flash Microcontrollers with
10-bit A/D and nanoWatt Technology

Power Managed Modes:

• Run: CPU on, peripherals on
• Idle: CPU off, peripherals on
• Sleep: CPU off, peripherals off
• Idle mode currents down to 3.0 µA typical
• Sleep mode currents down to 20 nA typical
• Timer1 Oscillator: 1.8 µA, 32 kHz, 2V
• Watchdog Timer: 2.1 µA
• Two-Speed Oscillator Start-up

Peripheral Highlights:

• High-current sink/source 25 mA/25 mA
• Up to 2 Capture/Compare/PWM (CCP) modules,
  one with Auto-Shutdown (28-pin devices)
• Enhanced Capture/Compare/PWM (ECCP)
  module (40/44-pin devices only):
  - One, two or four PWM outputs
  - Selectable polarity
  - Programmable dead time
  - Auto-Shutdown and Auto-Restart
• Master Synchronous Serial Port (MSSP) module
  supporting 3-wire SPI™ (all 4 modes) and I2C™
  Master and Slave Modes
• Enhanced Addressable USART module:
  - Supports RS-485, RS-232 and LIN 1.2
  - RS-232 operation using internal oscillator
    block (no external crystal required)
  - Auto-Wake-up on Start bit
  - Auto-Baud Detect
• 10-bit, up to 13-channel Analog-to-Digital
  Converter module (A/D):
  - Auto-acquisition capability
  - Conversion available during Sleep
• Dual analog comparators with input multiplexing
• Programmable 16-level High/Low-Voltage
  Detection (HLVD) module:
- Supports interrupt on High/Low-Voltage
  Detection

Flexible Oscillator Structure:

• Four Crystal modes, up to 40 MHz
• 4x Phase Lock Loop (PLL) – available for crystal
  and internal oscillators
• Two External RC modes, up to 4 MHz
• Two External Clock modes, up to 40 MHz
• Internal oscillator block:
  - 8 user selectable frequencies, from 31 kHz to 8 MHz
  - Provides a complete range of clock speeds
    from 31 kHz to 32 MHz when used with PLL
- User tunable to compensate for frequency drift
• Secondary oscillator using Timer1 @ 32 kHz
• Fail-Safe Clock Monitor:
  - Allows for safe shutdown if peripheral clock stops

Special Microcontroller Features:

• C compiler optimized architecture:
  - Optional extended instruction set designed to
    optimize re-entrant code
• 100,000 erase/write cycle Flash program memory
  typical
• Three programmable external interrupts
• Four input-change interrupts
• Priority levels for interrupts
• 8 x 8 Single-Cycle Hardware Multiplier
• Extended Watchdog Timer (WDT):
  - Programmable period from 4 ms to 131s
• Single-supply 5V In-Circuit Serial
  Programming™ (ICSP™) via two pins
• In-Circuit Debug (ICD) via two pins
• Wide operating voltage range: 2.0V to 5.5V
• Programmable Brown-out Reset (BOR) with
  software enable option
