AN2633 datasheet(38/48 Pages) STMICROELECTRONICS

38 / 48 page

Operating measurements

AN2633

38/48

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 Sleep mode and the

LED connected to P9.1 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 with the

oscillator as clock source.

Test 6,7,8 and 9: LPMode_Sleep_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 enters Sleep 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 has woken up from Sleep mode, a LED connected to P9.0 is

toggled.

Test 10,11,12 and 13: LPMode_Sleep_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 Sleep mode 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 Sleep mode, a LED connected to P9.0 pin is

toggled.

Test 14,15,16 and 17: LPMode_Sleep_ExternalReset

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 Sleep mode and the

LED connected to P9.1 is switched off.

The system waits until you push RESET pin to wake-up from Sleep mode. To indicate

that the power mode is Normal Run mode a LED connected to P9.1 pin is switched on.

Note:

All sleep mode tests work only with the oscillator as clock source

3.2.8

Idle mode tests

These tests show how to put the system in Idle mode and then to wake-up from this mode

using either an RTC alarm, an external wake-up, an external wake-up interrupt, a Watchdog

reset, a Watchdog timer interrupt, an UART interrupt or an external reset.

In Idle mode, there are 2 possible configurations:

●

Periph_ON: indicates that all peripherals are enabled.

●

Periph_OFF: indicates that all peripherals are disabled.

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