This is one of the semiconductor types. This part name is D78F0534.
This product has UPD78F0534 functions.
Manufacturers of product is NEC.
Image and pinout :
D78F0534 PDF Datasheet
Some of the text files within the PDF file
Preliminary User’s Manual 78K0/KE2 8-Bit Single-Chip Microcontrollers µPD78F0531 µPD78F0532 µPD78F0533 µPD78F0534 µPD78F0535 µPD78F0536 µPD78F0537 µPD78F0537D The µPD78F0537D 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 Document No. U17260EJ3V1UD00 (3rd edition) Date Published August 2005 N CP(K) Printed in Japan 2004 [MEMO] 2 Preliminary User’s Manual U17260EJ3V1UD NOTES FOR CMOS DEVICES 1 VOLTAGE APPLICATION WAVEFORM AT INPUT PIN Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may malfunction. Take care to prevent chattering noise from entering the device when the input level is fixed, and also in th [ … ]
Please refer to the file for details.