the state is set to lcd display show the first two instructions

Instruction modules and LCD driver HD61202 compatible controller, a total of seven instructions. Not described in detail here, as listed in Table 2 only instruction list. Among them, the state is set to show the first two instructions, the rest of the Lcd modules class to read and write commands.VGS12864E interface connection in two ways: one is the direct access mode, the other is indirect access. Either lcd display way you want to access the module must first read the contents of the status register to determine the "busy" flag can be accessed when not busy. Direct access method is a module interface as a memory or I / O devices directly linked to the MCU bus, MCU to access memory or I / O device Serial display modules  the module operation. Indirect access MCU module is operated via software simulation control timing.Write instructions on the display module and write data write operation into the left screen and write the right screen. The difference between writing about half the screen is only set corresponding chip select signals, and the difference between writing instruction and writing data when the write data is set RS register select signal. Initialization operation is completed and opened to determine the display position of the display.