STLUX385ATR datasheet(18/99 Pages) STMICROELECTRONICS

18 / 99 page

Product overview

STLUX385A

18/98

DocID024387 Rev 2

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 time-out 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. If the hardware watchdog

feature is enabled through the device 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 count.

3.4

Flash program and data E2PROM

Embedded Flash and E

PROM with 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 E

PROM

•

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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