Table 16.7-1 Statuses Of The Hardware Sequence Flag - Fujitsu MB91F109 FR30 Hardware Manual

Table 16.7-1 lists the possible statuses of the hardware sequence flag.

Table 16.7-1 Statuses of the Hardware Sequence Flag

Status
Executing Automatic read operation
Automatic erase operation
Temporary
erase stop
mode
Time limit Automatic write operation
exceeded
Automatic erase operation
Write operation during
temporary erase stop
*1: Bit 2 toggles for consecutive read operations from sectors in temporary erase stop.
*2: Bit 6 toggles for consecutive read operations from any address.
*3: During temporary erase stop and write operations, bit 2 indicates "1" while reading the address for
the write operation. However, bit 2 toggles for consecutive read operations from sectors in temporary
erase stop.
[bit 7] DPOLL (Data polling)
Automatic write operation status
When a read operation is performed during execution of the automatic write algorithm, flash
memory outputs the inversion of the last written data.
end of the automatic write algorithm, flash memory outputs the data of bit 7 of the read data in
the address indicated by the address signal.
Automatic erase operation status
When a read operation is performed during execution of the automatic erase algorithm, flash
memory outputs "0" irrespective of the address indicated by the address signal. Similarly, flash
memory outputs "1" at the end of the algorithm.
DPOLL
Reverse
Temporary erase
stop and read
(from sectors in
temporary erase
stop)
Temporary erase
stop and read
(from sectors not
in temporary
erase stop)
Temporary erase Reverse
stop and write (to
sectors not in
temporary erase
stop)
Reverse
16.7 Execution Status of the Automatic Algorithm
TOGGLE
Toggle
data
0 Toggle
1 1
Data Data
2
Toggle*
data
Toggle
data
0 Toggle
0 Toggle
When read access is performed at the
TLOVER SETIMR
0 0
0 1
0 0
Data Data
0 0
1 0
1 1
1 1
TOGGL2
1
Toggle
1
Toggle*
Data
3
1*
1
Undefined
Undefined
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