Sector Erase Suspension - Fujitsu MB90335 Series Hardware Manual

CHAPTER 22 DUAL OPERATION FLASH MEMORY
22.7 Details of Programming/Erasing Flash Memory
22.7.5

Sector Erase Suspension

This section explains the procedure for inputting the sector erase suspend command to
suspend sector erasing. Data can be read from the sector not being erased.
■ Sector Erase Suspension
• To cause flash memory sector erasing to suspend, transmit the sector erasing suspend command in the
command sequence table from CPU to flash memory.
• The sector erasing suspend command suspends the sector erase currently being performed, enabling data
read from a sector that is currently not being erased.
• This command is only enabled during the sector erasing period including the erasing wait time; it is
ignored during the chip erasing period or during programming.
• The sector erasing suspend command is executed when the sector erasing suspend code (B0
programmed. Arbitrary address in flash memory should be set for address. If the sector erasing suspend
command is executed during sector erasing pause, the successive command input is ignored.
• When the sector erasing suspend command is input during the sector erasing wait period, the sector
erase wait state ends immediately, the erasing is interrupted, and the erase stop state occurs.
• When the erase suspend command is input during the sector erasing after the sector erase wait period,
the erase suspend state occurs after a maximum of 20 μs.
■ Note
To issue the suspension command, please issue the command after the following; 20 μs after the sector
erase command issue, or 20 μs after the sector erasing resumption command issue. However, please make
the issue number of times within several-time.
508 FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
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CM44-10137-6E
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