This document describes the PCA3351C series and PCD3351A series of 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM. The document includes features and general description of the products, as well as ordering information, pinning information, frequency generator, EEPROM and timer 2 organization, derivative interrupts, timing, reset, idle mode, stop mode, instruction set restrictions, overview of port and power-on-reset configurations, summary of derivative registers, handling, limiting values, DC characteristics, AC characteristics, package outlines, soldering, definitions, and life support applications.