STM8S003F3U6CTR datasheet(12/100 Pages) STMICROELECTRONICS

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

IAP and communication routines.

Figure 2: Flash memory organization

UBC area

Program memory area

Remains write protected during IAP

Write access possible for IAP

Option bytes

Programmable

bytes(1 page)

up to 8 Kbytes

(in 1 page steps)

area from 64

Low density

Flash program

memory

(8 Kbytes)

Data EEPROM (128 bytes)

Read-out protection (ROP)

The read-out protection blocks reading and writing from/to the Flash program memory and

the data EEPROM 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 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)

- 16 MHz high-speed internal RC oscillator (HSI)

- 128 kHz low-speed internal RC (LSI)

DocID018576 Rev 3

12/100

STM8S003K3 STM8S003F3

Product overview

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