The COP404C ROMless Microcontroller is a member of the COPSTM family fabricated using double-poly silicon gate CMOS (microCMOS) technology The COP404C contains CPU RAM I O and is identical to a COP444C device except the ROM has been removed and pins have been added to output the ROM address and to input the ROM data The COP404C can be configured by means of external pins to function as a COP444C a COP424C or a COP410C Pins have been added to allow the user to select the various functional options that are available on the family of mask-programmed CMOS parts The COP404C is primarily intended for use in the development and debug of a COP program for the COP444C 445C COP424C 425C and COP410C 411C devices prior to masking the final part The COP404C is also appropriate in low volume applications or when the program might be changing