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Calibrating low speed on chip oscillator

PrinceFree
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It a low power application which requires the micro to be in STOP mode 99.85% of the time. I want to use the fIL (low speed on chip oscillator: 15K=kHz +/- 15%), to generate periodic interrupts every 500msec. Timer RJ...

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    • Calibrating low speed on chip oscillator
    • It a low power application which requires the micro to be in STOP mode 99.85% of the time. I want to use the fIL (low speed on chip oscillator: 15K=kHz +/- 15%), to generate periodic interrupts every 500msec. Timer RJ is initialized to a certain value that corresponds to 500msec of real time. But given that this fIL has an accuracy of 15% (which is huge), I'd like to find a way to correct it in case it drifts 1 or 2% from 15kHz (it nominal frequency). Again, this could easily be solved with the use of an external crystal at XT1 and XT2 but I am moreso looking for a low cost solution. I wrote a piece of code that generates an interrupt every 500msec (there is an output I'm pulsing in its ISR, which I'm observing on the scope). However, I start seeing this period shrink, as I expose the micro to some external heat source, to like 497.4msecs... Is there a register that can reflect this change? I'm using the demoboard for RL78/G1F (specifically YQB-R5F11BLE-TB)
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