AN2476 datasheet(44/49 Pages) STMICROELECTRONICS

44 / 49 page

Operating measurements

AN2476

44/49

When the 4MHz external Quartz oscillator is disconnected, the VCO of the PLL (FREEOSC)

supplies the system clock. Once the 4MHz clock has recovered (by connecting the 4MHz

Quartz oscillator) the system clock is reconfigured to 64 MHz.

If the system fails to enter WFI mode, an LED connected to P2.19 pin is turned on.

●

Directory contents

–

75x_conf.h : Library Configuration file

–

75x_it.c : Interrupt handlers

–

main.c : Main program

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Hardware environment

–

Connect two LEDs to P2.18 and P2.19 pins (respectively LD4 and LD5 on

STR75x-EVAL board).

–

Connect a push-button to WKP_STDBY pin (P1.15) (Wakeup push-button on

STR75x-EVAL board).

–

Connect a push-button to EXTIT line7 pin (P1.05) (Key push-button on STR75x-

EVAL board).

–

On the STR75x-EVAL board the 4MHz Quartz oscillator is mounted on socket so it

is easy to disconnect it.

●

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

AN2476 Datasheet(PDF) 44 Page - STMicroelectronics

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