T1042 RTC!

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T1042 RTC!

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qammarabbas
Contributor IV

Hi,

How can i maintain real time while using T1042. One of the options is to use external RTC lC. Can i do the same using the "RTC" pin of T1042? If yes, what clock frequency is required at its input? Moreover, in the case of external RTC normally a cell is used as backup power supply, what here will be used as backup supply if the processor is shut down? Thank you!

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alexander_yakov
NXP Employee
NXP Employee

T1042 processor does not have RTC block or similar block, powered from cell and used to count time, when processor is not powered. External RTC IC should be used for this purpose.

T1042 device has RTC input, this input is frequency input, which can be used to feed internal timers. Normally, these timers are fed from internal PLL, which are not precise enough to be used as sources for time counting, so if time counting is mandatory than RTC input can be used to apply more reliable clock to internal timers. Retaining time at power-off is not possible, so it is assumed the device will synchronize its time with external time server at each power-on. If this synchronization solution is not acceptable, than external RTC IC is recommended.


Have a great day,
Alexander
TIC

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alexander_yakov
NXP Employee
NXP Employee

T1042 processor does not have RTC block or similar block, powered from cell and used to count time, when processor is not powered. External RTC IC should be used for this purpose.

T1042 device has RTC input, this input is frequency input, which can be used to feed internal timers. Normally, these timers are fed from internal PLL, which are not precise enough to be used as sources for time counting, so if time counting is mandatory than RTC input can be used to apply more reliable clock to internal timers. Retaining time at power-off is not possible, so it is assumed the device will synchronize its time with external time server at each power-on. If this synchronization solution is not acceptable, than external RTC IC is recommended.


Have a great day,
Alexander
TIC

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

244 Views
qammarabbas
Contributor IV

Hi Alexander,

Thanks a lot!

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