Fujitsu FR81S User Manual
CHAPTER 46: WORKFLASH MEMORY
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WORKFLASH MEMORY
FUJITSU SEMICONDUCTOR CONFIDENTIAL
34
5.8. Sector Erase Suspend Command
The sector erase suspend command is explained below
The sector erase can temporarily be stopped in the command time-out or while executing the sector erase.
The reading operation of the memory cell of the sector that is not the erase target becomes possible in the
suspend condition of the sector erase. However, a new neither writing nor erase command is accepted.
The sector erase suspend command is sent to an arbitrary address of target FLASH macro to suspend of the
sector erase.
After the sector erase stops, the reading operation from target FLASH macro is permitted.
At this time, the hardware sequence flag is read from the sector which is under the sector erase suspend
condition.
It enters the following states when entering the sector erase suspend condition.
⋅
The TOGG1 bit that does the toggle while erasing the sector does not toggle while being suspended from
the sector erase operation.
⋅
DFRDY of the WorkFlash status register becomes "1".
The thing that entered the sector erase suspend condition can be confirmed by using these.
Note:
16.7μs or less is required until the sector erase operation is stopped from the issue of the sector erase
suspend command and reading from the sector that is not the erase target becomes possible.
Because bit2:TOGG2 of the hardware sequence flag does the toggle while the sector erase is temporarily
stopping, the sector can be confirmed while stopping by using this bit.
To restart the interrupting erase operation from the sector erase suspend condition, the sector erase restart
command in Table 5-1 is sent.
The sector erase restart command is accepted only by the sector erase suspend condition.
Send the command after confirming becoming the sector erase suspend condition.
Accepting the erase restart command, the flash memory comes back to the sector erase condition, resuming
the erase operation.
MB91520 Series
MN705-00010-1v0-E
2005