S12 Clock, Reset and Power Management Unit (S12CPMU)
MC9S12G Family Reference Manual Rev.1.27
386 NXP Semiconductors
Table 10-23. TC trimming of the IRC1M frequency at ambient temperature
NOTE
Since the IRC1M frequency is not a linear function of the temperature, but
more like a parabola, the above relative variation is only an indication and
should be considered with care.
Be aware that the output frequency vary with TC trimming. A frequency
trimming correction is therefore necessary. The values provided in
Table 10-23 are typical values at ambient temperature which can vary from
device to device.
10.3.2.19 S12CPMU Oscillator Register (CPMUOSC)
This registers configures the external oscillator (XOSCLCP).
00111 -1.9% -2.5%
01000 -2.20% -3.0%
01001 -2.47% -3.4%
01010 -2.77% -3.9%
01011 -3.04 -4.3%
01100 -3.33% -4.7%
01101 -3.6% -5.1%
01110 -3.91% -5.6%
01111 -4.18% -5.9%
10000 0 (nominal TC of the IRC) 0%
10001 +0.27% +0.5%
10010 +0.54% +0.9%
10011 +0.81% +1.3%
10100 +1.07% +1.7%
10101 +1.34% +2.0%
10110 +1.59% +2.2%
10111 +1.86% +2.5%
11000 +2.11% +3.0%
11001 +2.38% +3.4%
11010 +2.62% +3.9%
11011 +2.89% +4.3%
11100 +3.12% +4.7%
11101 +3.39% +5.1%
11110 +3.62% +5.6%
11111 +3.89% +5.9%
TCTRIM[4:0]
IRC1M indicative
relative TC variation
IRC1M indicative frequency drift
for relative TC variation
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