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28.7
Detailed Explanation of Writing to and Erasing Flash
Memory
This section describes each operation procedure of flash memory Read/Reset, Write,
Chip Erase, Sector Erase, Sector Erase Suspend, and Sector Erase Restart when a
command that starts the automatic algorithm is issued.
■ Detailed Explanation of Flash Memory Write/Erase
The flash memory executes the automatic algorithm by issuing a command sequence (see Table 28.5-1 in
Section "28.5 Starting the Flash Memory Automatic Algorithm") for a write cycle to the bus to perform
Read/Reset, Write, Chip Erase, Sector Erase, Sector Erase Suspend, or Sector Erase Restart operations.
Each bus write cycle must be performed continuously. In addition, whether the automatic algorithm has
terminated can be determined using the data polling or other function. At normal termination, the flash
memory is returned to the read/reset state.
Each operation of the flash memory is described in the following order:
•
Setting the read/reset state
•
Writing data
•
Erasing all data (erasing chips)
•
Erasing optional data (erasing sectors)
•
Suspending sector erase
•
Restarting sector erase
CHAPTER 28 3M-BIT FLASH MEMORY
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