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MAIN MEMORY PAGE TO BUFFER TRANSFER: A page of data can be transferred from the main memory to either buffer l or buffer 2. An 8-bit opcode, 53H for buffer l and 55H for buffer 2, is followed by the five reserved bits, 10 address bits (PA9-PAO) which specify the page in main memory that is to be transferred, and nine don't care bits. The CS pin must be low while toggling the SCK pin to load the opcode, the address bits, and the don't care bits from the Sl pin. The transfer of the page of data from the main memory to the buer will begin when the CS pin transitions from a low to a high state. During the transfer of a page of data (tXFR), the status register can be read to determine whether the transfer has been completed or not.