STM8AF6268ITAY datasheet(20/99 Pages) STMICROELECTRONICS

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Product overview

STM8AF6246/48/66/68

20/99

DocID14952 Rev 11

5.6

Low-power operating modes

For efficient power management, the application can be put in one of four different low

power modes. Users can configure each mode to obtain the best compromise between

lowest power consumption, fastest start-up time and available wakeup sources.

•

Wait mode

In this mode, the CPU is stopped but peripherals are kept running. The wakeup is

performed by an internal or external interrupt or reset.

•

Active-halt mode with regulator on

In this mode, the CPU and peripheral clocks are stopped. An internal wakeup is

generated at programmable intervals by the auto wake up unit (AWU). The main

voltage regulator is kept powered on, so current consumption is higher than in Active-

halt mode with regulator off, but the wakeup time is faster. Wakeup is triggered by the

internal AWU interrupt, external interrupt or reset.

•

Active-halt mode with regulator off

This mode is the same as Active-halt with regulator on, except that the main voltage

regulator is powered off, so the wake up time is slower.

•

Halt mode

CPU and peripheral clocks are stopped, the main voltage regulator is powered off.

Wakeup is triggered by external event or reset.

In all modes the CPU and peripherals remain permanently powered on, the system clock is

applied only to selected modules. The RAM content is preserved and the brown-out reset

circuit remains activated.

5.7

Timers

5.7.1

Watchdog timers

The watchdog system is based on two independent timers providing maximum security to

the applications. The watchdog timer activity is controlled by the application program or

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 cause the

application program to abandon its normal sequence.

The window function can be used to trim the watchdog behavior 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.

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