Publisher Summary This chapter provides an overview of the PIC 18FXX2 peripherals and focuses on the enhancements which are available in the 18 Series world. When the peripherals of the 18FXX2 microcontrollers are compared to the peripherals of the 16F87XA, it can be seen that, in almost every case, the same peripherals appear, with the same name and in the same pattern. Differences to note are that the 18FXX2 claims an extra timer, Timer 3, but does not have the comparator module of the 16F87XA. The parallel ports of the 18FXX2 are very similar to those of the 16 Series, both in structure and interfacing. They each have a PORTX register for data transfer and a TRISX register to set data direction. All versions of the 18FXX2 have no less than four programmable timers, as well as a Watchdog Timer. The chapter describes the timers in turn, making extensive use of information already provided for their 16 Series equivalents.