I have a need for two different applications, one that uses the RTC and one that does not use the RTC on the TMS320C6748 device.
In both applications (RTC on and RTC off), we wish to decrease power consumption as much as possible.
In the application that uses the RTC, we plan on powering the RTC with the DSP core voltage and we do not have plans to keep the RTC powered on when the DSP core is powered off. We would also like to generate a one second periodic pulse from the RTC so the hardware guys can empirically determine suitable values for the capacitors hanging off of RTC_X1 and RTC_X0 pins per figure 6-84 in the data sheet.
1) Do I still need to set the SPLITPOWER bit in the control register (CTRL) to activate the leakage-isolation circuitry to decrease power consumption in the case where the DSP core and the RTC are either both powered on or both powered off?
2) Where would I find any information that would tell me what (electrical characteristics, triggering method, etc.) and when (associated timing) an output signal would appear on the RTC_ALARM pin?
3) Would it be possible to use the RTC_ALARM output as a one second periodic pulse for the aforementioned capacitor value characterization effort?
In the application that does not use the RTC, I understand that the RTC_XI pin should be held low, RTC_XO should be left unconnected, and the RTCDISABLE bit must be set in the control register (CTRL) to save power.
4) Do I still need to set the SPLITPOWER bit in the control register (CTRL) to activate the leakage-isolation circuitry to decrease power consumption in the case where we are not using the RTC?
