
467
19.5 Confirming the Automatic Algorithm Execution State
19.5.2 Toggle Bit Flag (DQ6)
The toggle bit flag specifies whether the automatic algorithm is being executed or has
been terminated, using the toggle bit function, the same as the data polling flag. Table Transition" shows the toggle bit flag status transition.
s When the Write Operation or Chip/Sector Erase Operation is Executed.
If continuous read access is made during execution of the automatic write algorithm or chip/
sector erase algorithm is being performed, the toggle bit flag (DQ6) outputs "1" and "0"
alternately (toggle output) each time read access is made. If continuous read access is made
after the automatic write algorithm or chip/sector erase algorithm is completed, DQ6 outputs the
value read each time read access is made.
s When the Sector Erase Suspend is Executed.
If read access is made while sector erase is halted, the toggle bit flag (DQ6) outputs "1" if the
read address is the sector currently being erased.
Otherwise, the value read by the read
access is output.
Reference:
If the sector to which data should be written is write-protected (sector protection), the toggle
output from the toggle bit flag (DQ6) terminates after about 2
s without rewriting data. If all
sectors to be erased are write-protected (sector protection), DQ6 returns to the read/reset
status after toggle output from DQ6 for about 100
s without rewriting data.
Transition" are extracted fro
m Table 19.5-2 "Hardware Sequence Flag Function List ".
Table 19.5-5 Toggle Bit Flag Status Transition - Status transition during normal operation
Operating
status
Write operation
-->Completion
Chip/sector
erase
-->Completion
Sector erase
wait
--> Start
Sector erase
-->Erase
suspend
(Sector being
erased)
Sector erase
suspend
-->Restart
(Sector being
erased)
During the
sector erase
suspend
(Sector not
being erased)
DQ6
Toggle
-->DATA:6
Toggle-->Stop
Toggle
Toggle-->1
1-->Toggle
DATA:6
Table 19.5-6 Toggle Bit Flag Status Transition - Status transition during abnormal
operation
Operating status
Write operation
Chip/sector erase operation
DQ6
Toggle