AN2633 datasheet(39/48 Pages) STMICROELECTRONICS

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AN2633

Operating measurements

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Test 18 and19: LPMode_Idle_RTCAlarm

The system enters this mode as follows:

After system power on, the system operates in Normal Run mode with the oscillator as

clock source.To indicate this, a LED connected to P9.1 is switched on.

When you push a button connected to pin P7.4, the system enters Idle mode with the

desired frequency and the LED connected to P9.1 pin is switched off.

The RTC is programmed to generate an interrupt every 10 seconds. Consequently,

after 10 seconds the RTC alarm wakes up the system causing a LED connected to

P9.0 pin to toggle. This is used to indicate that the MCU is in RUN mode operating with

the selected (uncommented) frequency.

Test 20 and 21: LPMode_Idle_ExternalWakeUP

The system enters this mode as follows:

After system power on, the system operates in Normal Run mode with the oscillator as

clock source.To indicate this, a LED connected to P9.1 is switched on.

When you push a button connected to pin P7.4, the system configures the selected

(uncommented) clock and then enters Idle mode and the LED connected to P9.1 is

switched off.

When a falling edge on EXINT2 line 16 is detected, an external wake-up is generated.

To indicate that the MCU wakes up from Idle mode with the selected (uncommented)

frequency, a LED connected to P9.0 is toggled.

Test 22 and 23: LPMode_Idle_ExternalWakeUP_Interrupt

The system enters this mode as follows:

After system power on, the system operates in Normal Run mode with the oscillator as

clock source.To indicate this, a LED connected to P9.1 is switched on.

When you push a button connected to pin P7.4, the system enters Idle mode with the

desired frequency and the LED connected to P9.1 is switched off.

When a falling edge on EXINT2 line 16 is detected, an interrupt is generated. To

indicate that the MCU wakes up from Idle mode with the selected (uncommented)

frequency, a LED connected to P9.0 pin is toggled.

Test 24 and 25: LPMode_Idle_WDG_Reset

The system enters this mode as follows:

After system power on, the system operates in Normal Run mode with the oscillator as

clock source.To indicate this, a LED connected to P9.1 is switched on.

When you push a button connected to pin P7.4, the system enters Idle mode with the

desired frequency and the LED connected to P9.1 is switched off.

The WDG is programmed to generate a system reset once every 5 seconds.

Consequently, after 5 seconds the WDG Reset wakes up the system with the oscillator

as clock source causing a LED connected to P9.1 to be switched on.

Test 26 and 27: LPMode_Idle_WDG_Timer

The system enters this mode as follows:

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