STM8S005C6T6 datasheet(12/103 Pages) STMICROELECTRONICS

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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 organization

Programmable area

Data

Program memory area

Data memory area ( 128 bytes)

EEPROM

UBC area

Remains write protected during IAP

memory

Write access possible for IAP

(1 page steps)

Option bytes

(2 first pages) up to

Medium density

Flash program memory

(32 Kbytes)

from 1 Kbyte

32 Kbytes

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.

Clock controller

4.5

The clock controller distributes the system clock (fMASTER) coming from different oscillators

to the core and the peripherals. It also manages clock gating for low power modes and ensures

clock robustness.

Features

• Clock prescaler: To get the best compromise between speed and current consumption

the clock frequency to the CPU and peripherals can be adjusted by a programmable

prescaler.

• Safe clock switching: Clock sources can be changed safely on the fly in run mode

through a configuration register. The clock signal is not switched until the new clock source

is ready. The design guarantees glitch-free switching.

• Clock management: To reduce power consumption, the clock controller can stop the

clock to the core, individual peripherals or memory.

• Master clock sources: Four different clock sources can be used to drive the master

clock:

- 1-16 MHz high-speed external crystal (HSE)

- Up to 16 MHz high-speed user-external clock (HSE user-ext)

DocID022186 Rev 3

12/103

STM8S005K6 STM8S005C6

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