This part is a kind of semiconductor called LPC921F.

Function of this product has P89LPC921F.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

P89LPC920/921/922 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM Rev. 06 21 November 2003 Product data 1. General description The P89LPC920/921/922 are single-chip microcontrollers designed for applications demanding high-integration, low cost solutions over a wide range of performance requirements. The P89LPC920/921/922 is based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system-level functions have been incorporated into the P89LPC920/921/922 in order to reduce component count, board space, and system cost. 2. Features 2.1 Principal features s 2 kB/4 kB/8 kB Flash code memory with 1 kB erasable sectors [ ... ]

LPC921F PDF Datasheet Download