This part is a kind of semiconductor called 7540.

Function of this product has SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER.

Manufacturers : Renesas

Image and pinout :

Some of the text within the PDF file :

7540 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER REJ03B0011-0400 Rev.4.00 Jun 21, 2004 DESCRIPTION The 7540 Group is the 8-bit microcomputer based on the 740 family core technology. The 7540 Group has a serial I/O, 8-bit timers, a 16-bit timer, and an A/D converter, and is useful for control of home electric appliances and office automation equipment. FEATURES • Basic machine-language instructions .. 71 • The minimum instruction execution time . 0.34 µs (at 6 MHz oscillation frequency, double-speed mode for the shortest instruction) • Memory size ROM 8 K to 32 K bytes RAM . 384 to 768 bytes • Programmable I/O ports .. [ ... ]

7540 PDF Datasheet Download