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.
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)
