This part is a kind of semiconductor called D78F0523.

Function of this product has UPD78F0523.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

Preliminary User’s Manual 78K0/KD2 8-Bit Single-Chip Microcontrollers µPD78F0521 µPD78F0522 µPD78F0523 µPD78F0524 µPD78F0525 µPD78F0526 µPD78F0527 µPD78F0527D The µPD78F0527D has an on-chip debug function. Do not use this product for mass production because its reliability cannot be guaranteed after the on-chip debug function has been used, due to issues with respect to the number of times the flash memory can be rewritten. NEC Electronics does not accept complaints concerning this product. Document No. U17312EJ2V1UD00 (2nd edition) Date Published August 2005 NS CP(K) Printed in Japan 2005 Free Datasheet http://www.Datasheet4U.com [MEMO] 2 Preliminary User’s Manual U17312EJ2V1UD Free Datasheet http://www.Datasheet4U.com NOTES FOR CMOS DEVICES 1 VOLTAGE APPLICATION WA [ ... ]

D78F0523 PDF Datasheet Download