DEVICE OVERVIEW
This document contains device specific information for the following devices:

• PIC18F248
• PIC18F258
• PIC18F448
• PIC18F458

These devices are available in 28-pin, 40-pin and 44-pin packages. They are differentiated from each other in four ways:

1. PIC18FX58 devices have twice the Flash program memory and data RAM of PIC18FX48 devices (32 Kbytes and 1536 bytes vs. 16 Kbytes and 768 bytes, respectively).
2. PIC18F2X8 devices implement 5 A/D channels, as opposed to 8 for PIC18F4X8 devices.
3. PIC18F2X8 devices implement 3 I/O ports, while PIC18F4X8 devices implement 5.
4. Only PIC18F4X8 devices implement the Enhanced CCP module, analog comparators and the  Parallel Slave Port.

All other features for devices in the PIC18FXX8 family, including the serial communications modules, are identical. These are summarized in Table 1-1. Block diagrams of the PIC18F2X8 and PIC18F4X8 devices are provided in Figure 1-1 and Figure 1-2, respectively. The pinouts for these device families are listed in Table 1-2.

High-Performance RISC CPU:
• Linear program memory addressing up to 2 Mbytes
• Linear data memory addressing to 4 Kbytes
• Up to 10 MIPS operation
• DC – 40 MHz clock input
• 4 MHz-10 MHz oscillator/clock input with PLL active
• 16-bit wide instructions, 8-bit wide data path
• Priority levels for interrupts
• 8 x 8 Single-Cycle Hardware Multiplier

Peripheral Features:
• High current sink/source 25 mA/25 mA
• Three external interrupt pins
• Timer0 module: 8-bit/16-bit timer/counter with 8-bit programmable prescaler
• Timer1 module: 16-bit timer/counter
• Timer2 module: 8-bit timer/counter with 8-bit period register (time base for PWM)
• Timer3 module: 16-bit timer/counter
• Secondary oscillator clock option – Timer1/Timer3
• Capture/Compare/PWM (CCP) modules; CCP pins can be configured as:
- Capture input: 16-bit, max resolution 6.25 ns
- Compare: 16-bit, max resolution 100 ns (TCY)
- PWM output: PWM resolution is 1 to 10-bit
  Max. PWM freq. @:8-bit resolution = 156 kHz
                   10-bit resolution = 39 kHz
• Enhanced CCP module which has all the features of the standard CCP module, but also has the following features for advanced motor control:
- 1, 2 or 4 PWM outputs
- Selectable PWM polarity
- Programmable PWM dead time
• Master Synchronous Serial Port (MSSP) with two modes of operation:
- 3-wire SPI™ (Supports all 4 SPI modes)
- I2C™ Master and Slave mode
• Addressable USART module:
- Supports interrupt-on-address bit

Advanced Analog Features:
• 10-bit, up to 8-channel Analog-to-Digital Converter module (A/D) with:
- Conversion available during Sleep
- Up to 8 channels available
• Analog Comparator module:
- Programmable input and output multiplexing
• Comparator Voltage Reference module
• Programmable Low-Voltage Detection (LVD) module:
- Supports interrupt-on-Low-Voltage Detection
• Programmable Brown-out Reset (BOR) CAN bus Module Features:
• Complies with ISO CAN Conformance Test
• Message bit rates up to 1 Mbps
• Conforms to CAN 2.0B Active Spec with:
- 29-bit Identifier Fields
- 8-byte message length
- 3 Transmit Message Buffers with prioritization
- 2 Receive Message Buffers
- 6 full, 29-bit Acceptance Filters
- Prioritization of Acceptance Filters
- Multiple Receive Buffers for High Priority
  Messages to prevent loss due to overflow
- Advanced Error Management Features

Special Microcontroller Features:
• Power-on Reset (POR), Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
• Watchdog Timer (WDT) with its own on-chip RC oscillator
• 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 ProgrammingTM (ICSPTM) via two pins

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