MAX7456 OSD 视频上叠加字符 汉字 图形的芯片控制代码
代码说明：
程序已经通过硬件实用，MAX7456单通道单色随屏显示(OSD)发生器省去了外部视频驱动器、同步分离器、视频开关以及EEPROM，有效降低系统成本。MAX7456采用符合NTSC和PAL制式的256个用户可编程字符，适合全球市场。MAX7456能够方便地以任意字符、尺寸显示各种信息，例如公司标识、常用图形、时间、日期等。MAX7456预先装载了256个字符和图形，并可通过SPI™ 接口进行在线编程。-MAX7456 single-channel monochrome on-screen display (OSD) generator eliminates the need for an external video driver, sync separator, video switch, and EEPROM, reduce system costs. MAX7456 NTSC, PAL standard used in line with the 256 user-programmable characters for the global market. MAX7456 can easily to any character, size, display various information such as company logos, common graphics, time, date and so on. MAX7456 pre-loaded with 256 characters and graphics, and online through the SPI ™ interface programming.
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