MC9S12G Datasheet, PDF (360/1160 Pages) Freescale Semiconductor, Inc – Ignores external trigger. Performs one conversion sequence and stops.

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 configures the external oscillator (XOSCLCP).
MC9S12G Family Reference Manual, Rev.1.01
360
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.