This part is a kind of semiconductor called UPD789022.

Function of this product has 8-Bit Single-Chip Microcontrollers.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

User’s Manual µPD789026 Subseries 8-Bit Single-Chip Microcontrollers µPD789022 µPD789024 µPD789025 µPD789026 µPD78F9026A Document No. U11919EJ3V0UMJ1 (3rd edition) Date Published October 2000 N CP(K) © Printed in Japan 1998 1996, 1999 [MEMO] 2 User's Manual U11919EJ3V0UM00 SUMMARY OF CONTENTS CHAPTER 1 CHAPTER 2 CHAPTER 3 CHAPTER 4 CHAPTER 5 CHAPTER 6 CHAPTER 7 CHAPTER 8 CHAPTER 9 GENERAL 23 PIN FUNCTIONS..33 CPU ARCHITECTURE. [ ... ]

UPD789022 PDF Datasheet Download