Fujitsu FR81S Manual Do Utilizador
CHAPTER 46: WORKFLASH MEMORY
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WORKFLASH MEMORY
FUJITSU SEMICONDUCTOR CONFIDENTIAL
32
5.7. Sector Erase Command
The sector erase command is shown below.
A sector in the flash memory can be selected and only data in the selected sector can be deleted. Multiple
sectors can also be specified at the same time. Sector erase is performed in the following order.
1. Send sector erase commands sequentially to the target sector
Once 40μs has elapsed (timeout period), the automatic algorithm starts and the sector erase operation is
started. If you want to erase multiple sectors, write the erase code (30
H
) to the address of the sector to
erase within the 40μs (timeout period). If the write is performed after the timeout period has elapsed,
the sector erase command may be invalid.
2. Perform read access to an arbitrary address
The read data is the hardware sequence flag. Therefore, when bit7 (DPOLL bit) of the read data is "1",
the sector erase has finished. Furthermore, you can use the TOGG1 bit to check whether or not the
sector erase has finished.
The following shows an example of the sector erase procedure taking the example of using the TOGG1
bit in the check operation.
MB91520 Series
MN705-00010-1v0-E
2003