Abstract: An apparatus and method for rotating OSD fonts are disclosed. The OSD rotation device including a central processing unit, font addresses generator, memory, a font ROM, a decoder, a shift register, a output controller and output circuits, a synchronization signal generator, and a display device. In a manner, the OSD fonts corresponding to the OSD font addresses are produced. Next, the OSD fonts is read and delivered to the decoder. Further, the decoder performs a decoding process for the OSD fonts to form a plurality of rotated fonts. The OSD message, including the rotated fonts, is displayed on a display device so that the video display is synchronized with the OSD message.

Abstract: The embedded micro-controller unit includes a serial interface according to the present invention. A program control device connects the embedded micro-controller unit. The serial interface will send a request signal to a micro-processor while renewing program codes. The micro-processor will transfer the power of controlling program memory to the serial interface and then go into idle state or halt state after receiving the request signal. The program control device may directly write new program codes into the program memory through the serial interface.