UM0224 datasheet(17/34 Pages) STMICROELECTRONICS

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STR75x demonstration software

Running the demonstrations

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Note:

The Alarm wave is played only if this wave is loaded in the SMI flash, otherwise the alarm

event is used only to wake-up the system from low power modes.

2.4.2

Low power modes

The STR750 microcontroller provides different operating modes in which the power

consumption is reduced. The purpose of this menu is to show the behavior of the

microcontroller in different low-power modes. STOP and STANDBY mode are taken as

examples.

RUN

STR750 provides a Power, Reset and Clock Configuration Unit (MRCC) which allows the

user to configure the system clock.

Selecting this item shows how an application can be run at different clocking frequencies.

Blinking LEDs show the effect of changing the clock.

The following message is displayed on the LCD:

The RUN menu contains five submenu items:

●

"60 MHz": the application runs at 60 MHz.

●

"56 MHz": the application runs at 56 MHz.

●

"48 MHz": the application runs at 48 MHz.

●

"4 MHz": the application runs at 4 MHz.

The user has to press the "SEL" push button to select one of the listed run modes.

"UP/DOWN" button have to be pushed to exit from any selected mode and return to 60 MHz

as default clock value.

STOP

This menu allows you to put the STR750 in STOP mode. The software performs the specific

sequence of instructions needed to enter STOP mode. STOP mode is characterized by:

●

Possibility to turn off the Main Oscillator and PLL

●

Possibility to turn off the Flash

●

Possibility to turn off the Main Voltage Regulator

●

Minimum power consumption

●

Automatic context saving

●

All Registers and SRAM contents are preserved

60 MHz

RUN Mode

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