ST7FL15F1MAE STMICROELECTRONICS [STMicroelectronics], ST7FL15F1MAE Datasheet - Page 12

• Manufacturer Part Number: ST7FL15F1MAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7L15, ST7L19
FLASH PROGRAM MEMORY (cont’d)
4.5 MEMORY PROTECTION
There are two different types of memory protec-
tion: Readout Protection and Write/Erase Protec-
tion, which can be applied individually.
4.5.1 Readout Protection
Readout protection, when selected, protects
against program memory content extraction and
against write access to Flash memory. Even if no
protection can be considered as totally unbreaka-
ble, the feature provides a very high level of pro-
tection for a general purpose microcontroller. Both
program and data E
In Flash devices, this protection is removed by re-
programming the option. In this case, both pro-
gram and data E
erased and the device can be reprogrammed.
Readout protection selection depends on the de-
vice type:
– In Flash devices it is enabled and removed
– In ROM devices it is enabled by the mask
4.5.2 Flash Write/Erase Protection
Write/erase protection, when set, makes it impos-
sible to both overwrite and erase program memo-
ry. It does not apply to E
provide advanced security to applications and pre-
vent any change being made to the memory con-
tent.
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1
through the FMP_R bit in the option byte.
option specified in the Option List.
2
2
memory are protected.
memory are automatically
2
data. Its purpose is to
Warning: Once set, Write/erase protection can
never be removed. A write-protected Flash device
is no longer reprogrammable.
Write/erase protection is enabled through the
FMP_W bit in the option byte.
4.6 RELATED DOCUMENTATION
For details on Flash programming and ICC proto-
col, refer to the ST7 Flash Programming Refer-
ence Manual and to the ST7 ICC Protocol Refer-
ence Manual
4.7 REGISTER DESCRIPTION
FLASH CONTROL/STATUS REGISTER (FCSR)
Read/Write
Reset Value: 000 0000 (00h)
1st RASS Key: 0101 0110 (56h)
2nd RASS Key: 1010 1110 (AEh)
Note: This register is reserved for programming
using ICP, IAP or other programming methods. It
controls the XFlash programming and erasing op-
erations.
When an EPB or another programming tool is
used (in socket or ICP mode), the RASS keys are
sent automatically.
7
0
0
.
0
0
0
OPT
LAT
PGM
0