MC9S12P128_10 Datasheet, PDF (232/566 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

S12 Clock, Reset and Power Management Unit (S12CPMU)
frequency
TCTRIM[3:0]=0x1111
TCTRIM[3:0]=0x1000 or 0x0000 (nominal TC)
TCTRIM[3:0]=0x0111
0x1111
0x1110
0x1101
0x1100
0x1011
0x1010
0x1001
TC increases
0x0001
0x0010
0x0011
0x0100
0x0101
0x0110
0x0111
TC decreases
- 40C
150C
temperature
Figure 7-27. Influence of TCTRIM[3:0] on the Temperature Coefficient
NOTE
The frequency is not necessarily linear with the temperature (in most cases
it will not be). The above diagram is meant only to give the direction
(positive or negative) of the variation of the TC, relative to the nominal TC.
Setting TCTRIM[3:0] to 0x0000 or 0x1000 does not mean that the
temperature coefficient will be zero. These two combinations basically
switch off the TC compensation module, which results in the nominal TC of
the IRC1M.
S12P-Family Reference Manual, Rev. 1.13
232
Freescale Semiconductor