这是台湾realtek的显示器驱动板上面的mcu 完整 datasheet。适合做display开发的程序员参考。rtd2120是一颗带特殊功能的80c52芯片。内部code空间64k，外部code空间32k，外部32k可当eeprom操作。-This is Taiwan realtek display driver board above mcu complete datasheet. Suitable for display developed by programmers. rtd2120 is 80c52 chip with a special function. Internal code space 64k, the external code space 32k, 32k can be used as an external eeprom operation.