
PIC18F2420/2520/4420/

28/40/44-Pin Enhanced 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 5.8 A typical
 Sleep mode current down to 0.1 A typical
 Timer1 Oscillator: 1.8 A, 32 kHz, 2V
 Watchdog Timer: 2.1 A
 Two-Speed Oscillator Start-up

Peripheral Highlights:

 High-current sink/source 25 mA/25 mA
 Three programmable external interrupts
 Four input change interrupts
 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)

Flexible Oscillator Structure:

 Four Crystal modes, up to 40 MHz
 4X Phase Lock Loop (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 Enhanced Flash
  program memory typical
 1,000,000 erase/write cycle Data EEPROM
  memory typical
 Flash/Data EEPROM Retention: 100 years typical
 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
 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 16-level High/Low-Voltage
  Detection (HLVD) module:
  - Supports interrupt on High/Low-Voltage
    Detection
 Programmable Brown-out Reset (BOR
  - With software enable option
