This part is a kind of semiconductor called 780023A.
Function of this product has UP780023A.
Manufacturers : NEC
Image and pinout :
Some of the text within the PDF file :
DATA SHEET µPD780021A, 780022A, 780023A, 780024A 780021AY, 780022AY, 780023AY, 780024AY 8-BIT SINGLE-CHIP MICROCONTROLLERS MOS INTEGRATED CIRCUIT DESCRIPTION The µPD780021A, 780022A, 780023A, and 780024A are members of the µPD780024A Subseries of the 78K/0 Series. Only selected functions of the existing µPD78054 Subseries are provided, and the serial interface is enhanced. The µPD780021AY, 780022AY, 780023AY, and 780024AY are the µPD780024A Subseries with a multimaster supporting I2C bus interface, which makes them suitable for AV equipment. Flash memory versions, the µPD78F0034A, 78F0034B, 78F0034AY, and 78F0034BY, that can operate in the same power supply voltage range as the mask ROM versions, and various development tools, are also available. Detailed func [ ... ]