ST6200C datasheet(32/100 Pages) STMICROELECTRONICS

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ST6200C/ST6201C/ST6203C

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6.2 WAIT MODE

The MCU goes into WAIT mode as soon as the

WAIT instruction is executed. This has the follow-

ing effects:

– Program execution is stopped, the microcontrol-

ler software can be considered as being in a “fro-

zen” state.

– RAM contents and peripheral registers are pre-

served as long as the power supply voltage is

higher than the RAM retention voltage.

– The oscillator is kept running to provide a clock

to the peripherals; they are still active.

WAIT mode can be used when the user wants to

reduce the MCU power consumption during idle

periods, while not losing track of time or the ability

to monitor external events. WAIT mode places the

MCU in a low power consumption mode by stop-

ping the CPU. The active oscillator (main oscillator

or LFAO) is kept running in order to provide a clock

signal to the peripherals.

If the power consumption has to be further re-

duced, the Low Frequency Auxiliary Oscillator

(LFAO) can be used in place of the main oscillator,

if its operating frequency is lower. If required, the

LFAO must be switched on before entering WAIT

mode.

Exit from Wait mode

The MCU remains in WAIT mode until one of the

following events occurs:

– RESET (Watchdog, LVD or RESET pin)

– A peripheral interrupt (timer, ADC,...),

– An external interrupt (I/O port, NMI)

The Program Counter then branches to the start-

ing address of the interrupt or RESET service rou-

tine. Refer to Figure 20.

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