STM8S207MB datasheet(15/103 Pages) STMICROELECTRONICS

15 / 103 page

STM8S207xx, STM8S208xx

Product overview

Doc ID 14733 Rev 12

15/103

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

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.

Programmable area from 1 Kbyte

Data

UBC area

Program memory area

Data memory area (2 Kbytes)

(2 first pages) up to 128 Kbytes

EEPROM

Remains write protected during IAP

memory

128 Kbytes

Flash

Up to

Write access possible for IAP

program

memory

(1 page steps)

Option bytes

STM8S207MB 数据表(PDF) 15 Page - STMicroelectronics

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