UPSD3354DV-40U6 Datasheet, PDF (192/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

PSD module
UPSD33xx
27.4.18
Resume sector erase
If a Suspend Sector Erase instruction sequence was previously executed, the erase cycle
may be resumed with this instruction sequence. The Resume Sector Erase instruction
sequence consists of writing the command 30h to any valid address within the Flash array
that was suspended as shown in Table 117 on page 184.
27.4.19 Reset Flash
The Reset Flash instruction sequence resets the embedded algorithm running on the state
machine in the targeted Flash memory (Main or Secondary) and the memory goes into
Read Array mode. The Reset Flash instruction consists of one bus WRITE cycle as shown
in Table 117 on page 184, and it must be executed after any error condition that has
occurred during a Flash memory Program or Erase operation.
It may take the Flash memory up to 25µs to complete the Reset cycle. The Reset Flash
instruction sequence is ignored when it is issued during a Program or Bulk Erase operation.
The Reset Flash instruction sequence aborts any on-going Sector Erase operation and
returns the Flash memory to Read Array mode within 25µs.
te ^{Product(s) 27.4.20}
Reset signal applied to Flash memory
Whenever the PSD module receives a reset signal from the MCU module, any operation
occurring in either Flash memory array will be aborted and the array(s) will go to Read Array
mode. It may take up to 25µs to abort an operation and achieve Read Array mode.
A reset from the MCU module will result from any of these events: an active signal on the
UPSD33xx RESET_IN input pin, a watchdog timer timeout, detection of low V_CC, or a JTAG
debug channel reset event.
te ^{Product(s) - Obsole 27.4.21}
Flash memory sector protection
Each Flash memory sector can be separately protected against program and erase
operations. This mode can be activated (or deactivated) by selecting this feature in PSDsoft
Express and then programming through the JTAG Port. Sector protection can be selected
for individual sectors, and the 8032 cannot override the protection during run-time. The 8032
can read, but not change, sector protection.
Any attempt to program or erase a protected Flash memory sector is ignored. The 8032 may
read the contents of a Flash sector even when a sector is protected.
Sector protection status is not read using Flash memory instruction sequences, but instead
this status is read by the 8032 reading two registers within csiop address space shown in
Table 119 and Table 120 on page 193.
Obsole ^27.4.22
Flash memory protection during power-up
Flash memory WRITE operations are automatically prevented while V_DD is ramping up until
it rises above V_LKO voltage threshold at which time Flash memory WRITE operations are
allowed.
27.4.23
PSD module security bit
A programmable security bit in the PSD module protects its contents from unauthorized
viewing and copying. The security bit is set using PSDsoft Express and programmed into
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Doc ID 9685 Rev 7