Fujitsu MB96300 series Hardware Manual page 874

F2mc-16fx 16-bit

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CHAPTER 33 FLASH MEMORY

Sector Erase Timer Flag (DQ3)

The sector erase timer ﬂag (DQ3) is used to post whether the automatic algorithm is

being executed during the sector erase wait period after the Sector Erase command has

been started.

■ Sector erase timer Flag (DQ3)

Table 33.6-9 Sector erase timer flag state transitions (state change for normal operation) and Table 33.6-10

Sector erase timer flag state transitions (state change for abnormal operation) list the state transitions of the

sector erase timer flag.

Table 33.6-9 Sector erase timer ﬂag state transitions (state change for normal operation)

Table 33.6-10 Sector erase timer ﬂag state transitions (state change for abnormal

Operating state

Sector erase

Read-access after the Sector Erase command has been started causes the flash memory to output 0 if the

automatic algorithm is being executed during the sector erase wait period, regardless of the value at the

address specified by the address signal of the sector that issued the command. The flash memory outputs 1

if the sector erase wait period has been exceeded.

If the data polling function or toggle bit function indicates that the erase algorithm is being executed,

internally controlled erase has already started if this flag is 1. Continuous write of the sector erase codes or

commands other than the Sector Erase Suspend command will be ignored until erase is terminated.

If this flag is 0, the flash memory will accept write of additional sector erase codes. To confirm this, it is

recommended that the state of this flag be checked before continuing to write sector erase codes. If this flag

is 1 after the second state check, it is possible that additional sector erase codes may not be accepted.

Sector erase

Sector erase

suspend (sector

being erased)

Sector erase

Restarted (sector

(sector not being

being erased)