AN2476 datasheet(40/49 Pages) STMICROELECTRONICS

40 / 49 page

Operating measurements

AN2476

40/49

the LED connected to P0.16 is switched on and the VCO of the PLL (FREEOSC)

supplies the system clock.

After The clock configuration (system clock set to 60 MHz), the P2.18 pin restarts

toggling.

●

If RTC ON is not set (by commenting the line #define RTC_ON in 75x_conf.h file):

An LED connected to P2.18 pin is on, to indicate the MCU is in RUN mode.

–

When a falling edge is detected on EXTIT line7, an interrupt is generated, the

system enters STANDBY mode causing the P2.18 pin to switch off.

–

A rising edge on WKP_STDBY pin or an external RESET will wake-up the system

from STANDBY. Then the LED connected to P0.16 is switched on and the VCO of

the PLL(FREEOSC) supplies the system clock.

After The clock configuration (system clock set to 60 MHz), the P2.18 pin is switched

on.

●

Directory contents:

–

75x_conf.h : Library Configuration file

–

75x_it.c : Interrupt handlers

–

main.c : Main program

●

Hardware environment:

–

Connect an LED to pin P0.16 (LD3 on STR75x-EVAL board).

–

Connect an LED to pin P2.18 (LD4 on STR75x-EVAL board).

–

Connect a push-button to the WKP_STDBY pin (P1.15) (the wake-up push-button

on the STR75x-EVAL board).

–

Connect a push-button to EXTIT line7 pin (P1.05) (the key push-button on the

STR75x-EVAL board)

●

How to use it:

In order to make the program work, you must do the following :

Create a project and setup all your toolchain's start-up files

Compile the directory content files and required Library files :

75x_lib.c

75x_rtc.c

75x_gpio.c

75x_mrcc.c

75x_eic.c

75x_extit.c

75x_cfg.c

Link all compiled files and load your image into Flash

Run the example

Note:

If the line #Define RTC_ON is modified through commenting or uncommenting in the file

75x_conf.h, the project must be rebuilt

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