Application description

AN4102

8/16

Doc ID 023129 Rev 1

Figure 5.

Low-power run without LCD

The parts shown in light green shading are executed from the RAM so that the Flash

memory and regulator can be switched off and thus save more power since the LSI

oscillator is also switched to act as the main clock source.

START

LCD disable

RTC clock source none

RTC clock OFF

LCD clock OFF

LSI disable

Regulator ultra-low power mode

GPIO low power config

Disable external counter U7

Includes in Halt_Init()

function

Switch ON LSI

Switch OFF HSI

Enable interrupts

Switch OFF Flash memory

Switch OFF regulator

WFE set to external interrupt from PE6

Enable external counter U7

Wait for event () instruction

Interrupt

occurred?

NO

YES

Clear interrupt

Disable WFE

Switch ON regulator

Executed from RAM

Switch ON HSI

END

Includes in LPR_Init()

function and RAM segment

Low power mode