Device Overview

the pic18f2455/2550/4455/4550 family provides high‑performance 8‑bit microcontrollers with enhanced flash memory, usb support, nanowatt power saving modes, and a wide range of oscillator options using the pic microcontroller power‑saving with nanowatt technology alternate run modes reduce power consumption by up to 90% idle modes allow peripheral operation while the cpu is disabled on‑the‑fly switching supports dynamic power optimization using the pic microcontroller power‑saving with nanowatt technology alternate run modes reduce power consumption by up to 90% idle modes allow peripheral operation while the cpu is disabled on‑the‑fly switching supports dynamic power optimization key features summary feature pic18f2455 pic18f2550 pic18f4455 pic18f4550 operating frequency dc – 48 mhz dc – 48 mhz dc – 48 mhz dc – 48 mhz program memory (bytes) 24576 32768 24576 32768 data eeprom (bytes) 256 256 256 256 interrupt sources 19 19 20 20 i/o ports a,b,c,(e) a,b,c,(e) a,b,c,d,e a,b,c,d,e special modules module description nanowatt technology low‑power modes, on‑the‑fly switching, and reduced power consumption usb module usb 2 0 compliant, full‑speed/low‑speed support, integrated transceiver oscillator options 12 modes, pll up to 48 mhz, internal oscillator with fail‑safe support 10‑bit a/d converter up to 13 channels with programmable acquisition time enhanced ccp pwm with auto‑shutdown/restart and multiple outputs package comparison table package pin count available ports a/d channels 28 pin pdip/soic 28 a,b,c,(e) 10 40 pin pdip 40 a,b,c,d,e 13 44 pin qfn/tqfp 44 a,b,c,d,e 13 memory summary table memory type size endurance notes program flash 24k / 32k bytes 100,000 cycles enhanced flash data eeprom 256 bytes 1,000,000 cycles long retention > 40 years data ram 2048 bytes n/a shared across modules using the pic microcontroller power‑saving with nanowatt technology alternate run modes reduce power consumption by up to 90% idle modes allow peripheral operation while the cpu is disabled on‑the‑fly switching supports dynamic power optimization usb features usb 2 0 compliant module supports low‑speed and full‑speed usb operation includes an integrated transceiver and voltage regulator oscillator system supports an internal oscillator block with an 8 mhz base frequency pll operation supports clock speeds up to 48 mhz fail‑safe clock monitor enhances operational reliability memory system enhanced flash rated for up to 100,000 write cycles eeprom rated for up to 1,000,000 write cycles supports self‑programming and bootloader implementations analog/digital features up to 13 a/d channels, depending on package type programmable acquisition timing support communication modules enhanced usart with automatic baud rate detection mssp support for spi and i²c communication packages available 28‑pin pdip/soic 40‑pin pdip 44‑pin qfn/tqfp application use cases usb peripherals low‑power devices embedded control systems sensor interfacing applications