STM8S208MBT3TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM8S208MBT3TR

Performance line, 24 MHz STM8S 8-bit MCU, up to 128 KB Flash, integrated EEPROM, 10-bit ADC, timers, 2 UARTs, SPI, I²C, CAN

STMicroelectronics 

STM8S207xx, STM8S208xx

Product overview

The size of the UBC is programmable through the UBC option byte (Table 13.), in

increments of 1 page (512 bytes) by programming the UBC option byte in ICP mode.

This divides the program memory into two areas:

● Main program memory: Up to 128 Kbytes minus UBC

● User-specific boot code (UBC): Configurable up to 128 Kbytes

The UBC area remains write-protected during in-application programming. This means that

the MASS keys do not unlock the UBC area. It protects the memory used to store the boot

program, specific code libraries, reset and interrupt vectors, the reset routine and usually the

IAP and communication routines.

Figure 2. Flash memory organisation

Data

EEPROM

memory

Up to

128 Kbytes

Flash

program

memory

Data memory area (2 Kbytes)

Option bytes

UBC area

Remains write protected during IAP

Program memory area

Write access possible for IAP

Programmable area from 1 Kbyte

(2 first pages) up to 128 Kbytes

(1 page steps)

Read-out protection (ROP)

The read-out protection blocks reading and writing the Flash program memory and data

EEPROM memory in ICP mode (and debug mode). Once the read-out protection is

activated, any attempt to toggle its status triggers a global erase of the program and data

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.

Doc ID 14733 Rev 12

15/103

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