STM8AF52AA STMicroelectronics, STM8AF52AA Datasheet - Page 16

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STM8AF52AA

Manufacturer Part Number
STM8AF52AA
Description
STM8AF52 CAN Line
Manufacturer
STMicroelectronics
Datasheet

Specifications of STM8AF52AA

Max Fcpu
24 MHz
Program Memory
32 to 128 Kbytes Flash program; data retention 20 years at 55 °C
Data Memory
up to 2 Kbytes true data EEPROM; endurance 300 kcycles
Ram
2 Kbytes to 6 Kbytes
Advanced Control Timer
16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization

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Product overview
5.4.2
5.4.3
5.4.4
16/106
Write protection (WP)
Write protection in application mode is intended to avoid unintentional overwriting of the
memory. The write protection can be removed temporarily by executing a specific sequence
in the user software.
Protection of user boot code (UBC)
If the user chooses to update the Flash program memory using a specific boot code to
perform in application programming (IAP), this boot code needs to be protected against
unwanted modification.
In the STM8A a memory area of up to 128 Kbytes can be protected from overwriting at user
option level. Other than the standard write protection, the UBC protection can exclusively be
modified via the debug interface, the user software cannot modify the UBC protection status.
The UBC memory area contains the reset and interrupt vectors and its size can be adjusted
in increments of 512 bytes by programming the UBC and NUBC option bytes
(see
Figure 2.
Read-out protection (ROP)
The STM8A provides a read-out protection of the code and data memory which can be
activated by an option byte setting (see the ROP option byte in section 10).
The read-out protection prevents reading and writing Flash program memory, data memory
and option bytes via the debug module and SWIM interface. This protection is active in all
device operation modes. Any attempt to remove the protection by overwriting the ROP
option byte triggers a global erase of the program and data memory.
The ROP circuit may provide a temporary access for debugging or failure analysis. The
temporary read access is protected by a user defined, 8-byte keyword stored in the option
Section 9: Option bytes on page
Data
EEPROM
memory
Flash
program
memory
Flash memory organization of STM8A products
Remains write protected during IAP
Write access possible for IAP
Program memory area
Data memory area
Doc ID 14395 Rev 8
Option bytes
UBC area
51).
STM8AF52/62xx, STM8AF51/61xx
Programmable area from 1 Kbyte
(first two pages) up to program memory
end - maximum 128 Kbytes

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