The EM78P259N is an 8-bit mICroprocessor designed and developed with low-power and high-speed CMOS technology. The device has an on-chip 2Kx13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a protection bit to prevent intrusion of users code. Three Code option words are also available to meet users requirements. With its enhanced OTP-ROM feature, the EM78P259N provides a convenient way of developing and verifying users programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using development and programming tools. User can avail of the ELAN Writer to easily program his development code.