MC9S12G Datasheet, PDF (358/1160 Pages) Freescale Semiconductor, Inc – Ignores external trigger. Performs one conversion sequence and stops.

S12 Clock, Reset and Power Management Unit (S12CPMU)
Table 10-22. CPMUIRCTRIMH/L Field Descriptions
Field
Description
15-11
TCTRIM[4:0]
IRC1M temperature coefficient Trim Bits
Trim bits for the Temperature Coefficient (TC) of the IRC1M frequency.
Figure 10-26 shows the influence of the bits TCTRIM4:0] on the relationship between frequency and
temperature.
Figure 10-26 shows an approximate TC variation, relative to the nominal TC of the IRC1M (i.e. for
TCTRIM[4:0]=0x00000 or 0x10000).
9-0
IRC1M Frequency Trim Bits — Trim bits for Internal Reference Clock
IRCTRIM[9:0] After System Reset the factory programmed trim value is automatically loaded into these registers, resulting in a
Internal Reference Frequency f_{IRC1M_TRIM}. See device electrical characteristics for value of f_{IRC1M_TRIM}.
The frequency trimming consists of two different trimming methods:
A rough trimming controlled by bits IRCTRIM[9:6] can be done with frequency leaps of about 6% in average.
A fine trimming controlled by the bits IRCTRIM[5:0] can be done with frequency leaps of about 0.3% (this
trimming determines the precision of the frequency setting of 0.15%, i.e. 0.3% is the distance between two
trimming values).
Figure 10-25 shows the relationship between the trim bits and the resulting IRC1M frequency.
IRC1M frequency (IRCCLK)
1.5MHz
{ ^IRCTRIM[5:0]
1MHz
IRCTRIM[9:6]
......
600KHz
$000
Figure 10-25. IRC1M Frequency Trimming Diagram
IRCTRIM[9:0]
$3FF
MC9S12G Family Reference Manual, Rev.1.01
358
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.