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S9S12G128F0CLF Datasheet, PDF (356/1158 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual | |||
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S12 Clock, Reset and Power Management Unit (S12CPMU)
TCTRIM[4:0]
IRC1M indicative
relative TC variation
IRC1M indicative frequency drift
for relative TC variation
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%
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 conï¬gures the external oscillator (XOSCLCP).
MC9S12G Family Reference Manual, Rev.1.10
356
Freescale Semiconductor
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