This part is a kind of semiconductor called MC9S12DG256B.

Function of this product has device made up of standard HCS12 blocks and the HCS12 processor core.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Freescale Semiconductor, Inc. DOCUMENT NUMBER 9S12DP256BDGV2/D MC9S12DP256B Device User Guide V02.14 Covers also Freescale Semiconductor, Inc... MC9S12DT256C, MC9S12DJ256C, MC9S12DG256C, MC9S12DT256B, MC9S12DJ256B, MC9S12DG256B MC9S12A256B Original Release Date: 29 Mar 2001 Revised: Mar 5, 2003 Motorola, Inc Motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Motorola does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or othe [ ... ]

MC9S12DG256B PDF Datasheet Download