S12 Clock, Reset and Power Management Unit (S12CPMU)
IRC1M indicative
relative TC variation
IRC1M indicative frequency drift for
relative TC variation
TCTRIM[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0 (nominal TC of the IRC1M)
0%
-0.54%
-1.08%
-0.8%
-1.6%
-2.4%
-3.2%
-4.0%
-4.8%
-5.5%
0%
-1.63%
-2.20%
-2.77%
-3.33%
-3.91%
0 (nominal TC of the IRC1M)
+0.54%
+0.8%
+1.6%
+2.4%
+3.2%
+4.0%
+4.8%
+5.5%
+1.07%
+1.59%
+2.11%
+2.62%
+3.12%
+3.62%
Table 7-21. 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 TC 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 7-21 are typical values at ambient temperature which can vary from
device to device.
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
233
FREESCALE [ Freescale ]
