Table of Contents
Advertisement
CHAPTER 19 FLASH MEMORY
When the erase operation stops, flash memory enters the temporary erase stop and read mode.
Data reading is enabled in this mode for sectors that are not subject to temporary erase. Other
than that, there is no difference from the standard read operation. In this mode, bit2 toggles for
consecutive reading operations from sectors subject to temporary erase stop.
After the temporary erase stop and read mode is entered, the user can write to flash memory by
writing a Write command sequence. The write mode in this case is the temporary erase stop and
write mode. In this mode, data write operations become valid for sectors that are not subject to
temporary erase stop. Other than that, there is no difference from the standard byte writing
operation. In this mode, bit2 toggles for consecutive reading operations from sectors that are
subject to temporary erase stop. The temporary erase stop bit (bit6) can be used to detect this
operation.
Note that bit6 can be read from any address, but bit7 must be read from write addresses.
To restart the sector erase operation, a Restart Erase command (30
) must be entered. Another
H
Restart Erase command entry is ignored in this case. On the other hand, a Temporarily Stop
Erase command can be entered after flash memory restarts the erase operation.
647
Advertisement
Table of Contents
