This part is a kind of semiconductor called AN2140.

Function of this product has Serial Monitor for MC9S08GB/GT.

Manufacturers : freescale

Image and pinout :

Some of the text within the PDF file :

Freescale Semiconductor Application Note AN2140/D Rev. 1, 6/2003 Serial Monitor for MC9S08GB/GT Freescale Semiconductor, Inc... By Jim Sibigtroth 8/16 Bit Systems/Applications Engineering Austin, Texas Introduction This application note describes a 1-Kbyte monitor program for the MC9S08GB60 MCU. This program supports 19 primitive debug commands to allow FLASH programming and debug through an RS-232 serial interface to a personal computer. This monitor supports primitive commands to reset the target MCU, read or modify memory (including FLASH memory), read or modify CPU registers, go, halt, or trace single instructions. In order to allow a user to specify the address of each interrupt service routine, this monitor enables a hardware logic feature that redirects inter [ ... ]

AN2140 PDF Datasheet Download