STM8S103F3M3 datasheet(13/117 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

Data memory area ( 640 bytes)

Remains write protected during IAP

Data

EEPROM

memory

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)

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)

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DocID15441 Rev 9

Product overview

STM8S103K3 STM8S103F3 STM8S103F2

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