ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 23

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10k write/erase cycles guaranteed Data retention
• 128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
• A/d Converter: 10 input channels

ST7LITE49M
4.5
4.5.1
4.5.2
Caution:
4.6
4.7
Memory protection
There are two different types of memory protection: Read-out protection and Write/Erase
Protection which can be applied individually.
Read-out protection
Read-out protection, when selected provides a protection against program memory content
extraction and against write access to Flash memory. Even if no protection can be
considered as totally unbreakable, the feature provides a very high level of protection for a
general purpose microcontroller. Both program and data EEPROM memory are protected.
In Flash devices, this protection is removed by reprogramming the option. In this case, both
program and data EEPROM memory are automatically erased and the device can be
reprogrammed.
Read-Out Protection selection depends on the device type:
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●
Flash write/erase protection
Write/erase protection, when set, makes it impossible to both overwrite and erase program
memory. It does not apply to EEPROM data. Its purpose is to provide advanced security to
applications and prevent any change being made to the memory content. Write/erase
protection is enabled through the FMP_W bit in the option byte.
Once set, write/erase protection can never be removed. A write-protected Flash
device is no longer reprogrammable.
Related documentation
For details on Flash programming and ICC protocol, refer to the ST7 Flash programming
reference manual and to the ST7 ICC protocol reference manual
Description of Flash control/status register (FCSR)
This register controls the XFlash erasing and programming using ICP, IAP or other
programming methods.
1st RASS Key: 0101 0110 (56h)
2nd RASS Key: 1010 1110 (AEh)
When an EPB or another programming tool is used (in socket or ICP mode), the RASS keys
are sent automatically.
Reset value: 000 0000 (00h)
In Flash devices it is enabled and removed through the FMP_R bit in the option byte.
In ROM devices it is enabled by mask option specified in the option list.
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Read/write
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Flash programmable memory
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LAT
PGM
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