SPI与IIC区别（国外英文资料）.docVIP

SPI与IIC区别（国外英文资料） Spis application example: Execute the command, the first through the SPI serial port to send Flash a series of data, and then begin with command word, besides reading a status register, behind also keep up with the address, and pages within the byte address hair and some has nothing to do. Read main memory, first you need to send 64 - bit command to Flash, namely: the command word 52 (8 bit) + 4 r + page address bit (11), the starting address of the page in bytes (9 -) + 32 has nothing to do, to send out the 64 - bit (usually assembled into 8 bytes) after the command, which follows from the Flash reading the data (i.e., behind of SCK signals SO removed) from SO feet, each read a byte, automatically add 1 byte address, such as meet at the end of the page, SO long as has the SCK signal, the system to add to the switch of the page to read the data. Throughout the operation, the CS foot is always 0; When the CS foot returns to 1, the operation is terminated and the foot is restored to a high resistance state. Main memory to Bufferx refers to any page from the main memory page 2048 (determined by PA0 PA10) content is copied to the buffer, after sending the 32 bit command, as CS feet by 0 for the 1, after the data replication begins. The comparison of main memory and Bufferx basically is to see whether a page in main memory and buffer, when CS feet back to the 1, compared to, the result of the comparison (whether) records in the status register bit6. To erase Bufferx transmitted to main memory is copies the contents of the buffer to a page in main memory, before the copy the contents of the buffer should be copied to the main memory of a particular page, copy the former should erase all the page data in main memory, all of these operations until after CS feet back to the 1 to proceed. For a Bufferx that does not erase it to the main memory operation, the specified main memory page must have been erased before the command is executed. Bufferx as a buffer