STLUX datasheet(22/126 Pages) STMICROELECTRONICS

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Product overview

STLUX

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DocID027870 Rev 1

Thanks to the great configurability of the CCO frequency, the timer can cover a wide range

of interval time to fit better the target application requirements.

Auto-wakeup timer

The AWU timer is used to cyclically wake-up the IC device from the active halt state. The

AWU frequency time base fAWU can be selected between the following clock sources: LSI

(153.6 kHz) and the external clock HSE scaled down to 128-kHz clock.

By default the fAWU clock is provided by the LSI internal source clock.

Watchdog timers

The watchdog system is based on two independent timers providing a high level of

robustness to the applications. The watchdog timer activity is controlled by the application

program or by suitable option bytes. Once the watchdog is activated, it cannot be disabled

by the user program without going through reset.

Window watchdog timer

The window watchdog is used to detect the occurrence of a software fault, usually

generated by external interferences or by unexpected logical conditions, which causes the

application program to break the normal operating sequence.

The window function can be used to adjust the watchdog intervention period in order to

match the application timing perfectly. The application software must refresh the counter

before timeout and during a limited time window. If the counter is refreshed outside this time

window, a reset is issued.

Independent watchdog timer

The independent watchdog peripheral can be used to resolve malfunctions due to hardware

or software failures.

It is clocked by the 153.6 kHz LSI internal RC clock source. By properly setting the hardware

watchdog feature associated option bits, the watchdog is automatically enabled at power-

on, and generates a reset unless the key register is written by software before the counter

reaches the end of the count.

5.4

Flash program and data E2PROM

Embedded Flash and E2PROM with the memory ECC code correction and protection

mechanism preventing embedded program hacking.



32 Kbyte of single voltage program Flash memory



1 Kbyte true (not emulated) data E2PROM



Read while write: writing in the data memory is possible while executing code program

memory



The device setup is stored in a user option area in the non-volatile memory.

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