MSP430F5659: RTC not working

Hi Lumina,

Is the crystal work normal during shutdown mode?

B.R.

Sal

Hi Sal,

The crystal works normal during shutdown mode.

Thanks,

Kind Regards

Hi Sal,

The waveform of the 32.768KHz crystal is show as below:

The RTC time is not update even the 4G module have synchronized the system clock. Only after the battery was removed and then powered the device again, the RTC time will working normally.

Thanks,

Kind Regards

hi Lumina,

Thanks for the information. RTC is stuck according your information.

Can you share what your low power configuration about msp430, mainly includes below:

Lumina Gui said:

turned on again after being shut down for a long period of time

1.What is your low power mode in shutdown?  does it happen for a short period of time? How you turn on it from shutdown mode?

Lumina Gui said:

The RTC time is not update even the 4G module have synchronized the system clock.

2.Does any of other module work abnormal when it turned on?

Meanwhile, there is a description in Errata. You can check whether it will happen in customer usage.

B.R.

Sal

//***********************************************************************************
// Configures the system clocks:
// MCLK = SMCLK = DCO/FLL = mclkFreq (expected to be expressed in Hz)
// ACLK = FLLref = XT1 = 32.768kHz
//
// XT2 is not configured here. Instead, the USB API automatically starts XT2
// when beginning USB communication, and optionally disables it during USB
// suspend. It's left running after the USB host is disconnected, at which
// point you're free to disable it. You need to configure the XT2 frequency
// in the Descriptor Tool (currently set to 4MHz in this example).
// See the Programmer's Guide for more information.
//***********************************************************************************

#define MCU_MCLK 20000000
#define XT1_CLK 32768
#define XT2_CLK 24000000

void Sys_init_clocks(uint32_t mclkFreq)
{

while(BAKCTL & LOCKBAK) // Unlock XT1 pins for operation
BAKCTL &= ~(LOCKBAK);
UCS_turnOnLFXT1(UCS_XT1_DRIVE_0, UCS_XCAP_3); // UCS_XCAP_3
UCS_initClockSignal(UCS_ACLK, UCS_XT1CLK_SELECT, UCS_CLOCK_DIVIDER_1);
UCS_initClockSignal(UCS_FLLREF, UCS_XT1CLK_SELECT, UCS_CLOCK_DIVIDER_1);
UCS_initFLLSettle(mclkFreq/1000, mclkFreq/32768);
UCS_setExternalClockSource(XT1_CLK, XT2_CLK);
PMM_disableSvsLSvmL();
//PMM_disableSvsHSvmH();

// UCS_enableClockRequest(UCS_SMCLK);
//P3SEL|=BIT4; //P1.0鏉堟挸鍤瑼CLK
// P3DIR|=BIT4;

}

Sys_init_clocks(MCU_MCLK);