Fujitsu MB91319 Series Hardware Manual page 671

Table 19.5-1 lists the possible statuses of the hardware sequence flag.
Table 19.5-1 Statuses of the Hardware Sequence Flag
Status
Automatic read operation
Automatic erase operation
Executing
Temporary
erase stop
mode
Automatic write operation
Time limit
Automatic erase operation
exceeded
Write operation during
temporary erase stop
*1: TOGGLE2 toggles continuous read operations from sectors in temporary erase stop status.
*2: TOGGLE toggles continuous read operations from any address.
*3: During temporary erase stop status and write operations, TOGGLE2 indicates "1" while reading the
address for write operation. However, TOGGLE2 toggles continuous read operations from sectors in
temporary erase stop status.
*4: TOGGLE2 toggles continuous read operations for sectors under write/erase operation, but does not
toggle read operations for other sectors while TLOVER indicates "1," meaning that the time limit is
exceeded.
The hardware sequence flags are explained below.
[bit7] DPOLL (Data polling flag)
This flag is used with the data polling function to report that the automatic algorithm is being
executed or terminated.
❍ Automatic write operation status
When read access is performed while the automatic write algorithm is being executed, flash
memory outputs the inversion of bit7 of the last data written regardless of the address indicated
by the address signal. When read access is performed at the end of the automatic write
algorithm, flash memory outputs bit7 of the read data to the address indicated by the address
signal.
DPOLL
Reverse
data
Temporary erase
stop and read
(from sectors in
temporary erase
stop)
Temporary erase
stop and read
(from sectors not Data
in temporary
erase stop)
Temporary erase
stop and write (to
Reverse
sectors not in
data
temporary erase
stop)
Reverse
data
TOGGLE TLOVER
Toggle
0 Toggle
1 1
Data
2
Toggle*
Toggle
0 Toggle
0 Toggle
CHAPTER 19 FLASH MEMORY
SETIMR TOGGL2
0 0
0 1
0 0 Toggle*
Data Data
0 0
1 0
1 1
1 1
1
Toggle
1
Data
3
1*
1
*4
*4
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