DEVICE OVERVIEW
This document contains device specific information for the following devices:
• PIC18F6525
• PIC18F6621
• PIC18F8525
• PIC18F8621
This family offers the advantages of all PIC18 microcontrollers – namely, high computational performance at an economical price – with the addition of high-endurance Enhanced Flash program memory. The PIC18F6525/6621/8525/8621 family also provides an enhanced range of program memory options and versatile analog features that make it ideal for complex, high performance applications.

High Performance RISC CPU:
• Linear program memory addressing to 64 Kbytes
• Linear data memory addressing to 4 Kbytes
• 1 Kbyte of data EEPROM
• Up to 10 MIPs operation:
   - DC – 40 MHz osc./clock input
   - 4 MHz – 10 MHz osc./clock input with PLL active
• 16-bit wide instructions, 8-bit wide data path
• Priority levels for interrupts
• 31-level, software accessible hardware stack
• 8 x 8 Single-cycle Hardware Multiplier

Peripheral Features:
• High current sink/source 25 mA/25 mA
• Four external interrupt pins
• Timer0 module: 8-bit/16-bit timer/counter
• Timer1 module: 16-bit timer/counter
• Timer2 module: 8-bit timer/counter
• Timer3 module: 16-bit timer/counter
• Timer4 module: 8-bit timer/counter
• Secondary oscillator clock option – Timer1/Timer3
• Two Capture/Compare/PWM (CCP) modules:
   - Capture is 16-bit, max. resolution 6.25 ns (TCY/16)
   - Compare is 16-bit, max. resolution 100 ns (TCY)
   - PWM output: 1 to 10-bit PWM resolution
• Three Enhanced Capture/Compare/PWM (ECCP) modules:
   - Same Capture/Compare features as CCP
   - One, two or four PWM outputs
   - Selectable polarity
   - Programmable dead time
   - Auto-Shutdown on external event
   - Auto-Restart
• Master Synchronous Serial Port (MSSP) module with two modes of operation:
   - 2/3/4-wire SPI (supports all 4 SPI modes)
   - I2C™ Master and Slave mode
• Two Enhanced USART modules:
   - Supports RS-485, RS-232 and LIN 1.2
   - Auto-Wake-up on Start bit
   - Auto-Baud Rate Detect
• Parallel Slave Port (PSP) module

External Memory Interface
(PIC18F8525/8621 Devices Only):
• Address capability of up to 2 Mbytes
• 16-bit interface

Analog Features:
• 10-bit, up to 16-channel Analog-to-Digital Converter (A/D):
   - Auto-Acquisition
   - Conversion available during Sleep
• Programmable 16-level Low-Voltage Detection (LVD) module:
   - Supports interrupt on Low-Voltage Detection
• Programmable Brown-out Reset (BOR)
• Dual analog comparators:
   - Programmable input/output configuration

Special Microcontroller Features:
• 100,000 erase/write cycle Enhanced Flash program memory typical
• 1,000,000 erase/write cycle Data EEPROM memory typical
• 1 second programming time
• Flash/Data EEPROM Retention: > 100 years
• Self-reprogrammable under software control
• Power-on Reset (POR), Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
• Watchdog Timer (WDT) with its own On-Chip RC Oscillator for reliable operation
• Programmable code protection
• Power-saving Sleep mode
• Selectable oscillator options including:
   - 4x Phase Lock Loop (PLL) – of primary oscillator
   - Secondary Oscillator (32 kHz) clock input
• In-Circuit Serial Programming™ (ICSP™) via two pins
• MPLAB® In-Circuit Debug (ICD 2) via two pins

CMOS Technology:
• Low power, high-speed Flash technology
• Fully static design
• Wide operating voltage range (2.0V to 5.5V)
• Industrial and Extended temperature ranges