UPSD3212C, UPSD3212CV
Erasing Flash Memory
During execution of the Erase cycle, the Flash
memory accepts only RESET and Suspend Sec-
tor Erase instructions. Erasure of one Flash mem-
ory sector may be suspended, in order to read
data from another Flash memory sector, and then
resumed.
Suspend Sector Erase. When a Sector Erase
cycle is in progress, the Suspend Sector Erase in-
struction can be used to suspend the cycle by writ-
ing 0B0h to any address when an appropriate
Sector Select (FS0-FS3 or CSBOOT0-CSBOOT1)
is High. (See Table 62). This allows reading of
data from another Flash memory sector after the
Erase cycle has been suspended. Suspend Sec-
tor Erase is accepted only during an Erase cycle
and defaults to READ Mode. A Suspend Sector
Erase instruction executed during an Erase time-
out period, in addition to suspending the Erase cy-
cle, terminates the time out period.
Flash Bulk Erase. The Flash Bulk Erase instruc-
tion uses six WRITE operations followed by a
READ operation of the status register, as de-
scribed in Table 62. If any byte of the Bulk Erase
instruction is wrong, the Bulk Erase instruction
aborts and the device is reset to the READ Flash
memory status.
During a Bulk Erase, the memory status may be
checked by reading the Error Flag Bit (DQ5), the
Toggle Flag Bit (DQ6), and the Data Polling Flag
Bit (DQ7), as detailed in the section entitled “Pro-
gramming Flash Memory,” page 89. The Error
Flag Bit (DQ5) returns a '1' if there has been an
Erase Failure (maximum number of Erase cycles
have been executed).
It is not necessary to program the memory with
00h because the PSD MODULE automatically
does this before erasing to 0FFh.
The Toggle Flag Bit (DQ6) stops toggling when the
internal logic is suspended. The status of this bit
must be monitored at an address within the Flash
memory sector being erased. The Toggle Flag Bit
(DQ6) stops toggling between 0.1µs and 15µs af-
ter the Suspend Sector Erase instruction has been
executed. The Flash memory is then automatically
set to READ Mode.
If an Suspend Sector Erase instruction was exe-
cuted, the following rules apply:
– Attempting to read from a Flash memory sector
that was being erased outputs invalid data.
During execution of the Bulk Erase instruction, the
Flash memory does not accept any instructions.
Flash Sector Erase. The Sector Erase instruc-
tion uses six WRITE operations, as described in
Table 62. Additional Flash Sector Erase codes
and Flash memory sector addresses can be writ-
ten subsequently to erase other Flash memory
sectors in parallel, without further coded cycles, if
the additional bytes are transmitted in a shorter
time than the time-out period of about 100µs. The
input of a new Sector Erase code restarts the time-
out period.
– Reading from a Flash sector that was not being
erased is valid.
– The Flash memory cannot be programmed, and
only responds to Resume Sector Erase and
Reset Flash instructions (READ is an operation
and is allowed).
– If a Reset Flash instruction is received, data in
the Flash memory sector that was being erased
is invalid.
The status of the internal timer can be monitored
through the level of the Erase Time-out Flag Bit
(DQ3). If the Erase Time-out Flag Bit (DQ3) is '0,'
the Sector Erase instruction has been received
and the time-out period is counting. If the Erase
Time-out Flag Bit (DQ3) is '1,' the time-out period
has expired and the embedded algorithm is busy
erasing the Flash memory sector(s). Before and
during Erase time-out, any instruction other than
Suspend Sector Erase and Resume Sector Erase
instructions abort the cycle that is currently in
progress, and reset the device to READ Mode.
During a Sector Erase, the memory status may be
checked by reading the Error Flag Bit (DQ5), the
Toggle Flag Bit (DQ6), and the Data Polling Flag
Bit (DQ7), as detailed in the section entitled “Pro-
gramming Flash Memory,” page 89.
Resume Sector Erase. If
a
Suspend Sector
Erase instruction was previously executed, the
erase cycle may be resumed with this instruction.
The Resume Sector Erase instruction consists of
writing 030h to any address while an appropriate
Sector Select (FS0-FS3 or CSBOOT0-CSBOOT1)
is High. (See Table 62.)
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STMICROELECTRONICS [ ST ]
