Chapter 7 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V5)
S12ZVHY/S12ZVHL Family Reference Manual, Rev. 1.05
Freescale Semiconductor
271
Figure 7-30. Influence of TCTRIM[4:0] 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[4:0] at 0x00000 or 0x10000 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.
frequency
temperature
TCT
RIM
[4:0
] =
0x1
111
1
TCTRIM
[4:0] =
0x0111
1
- 40C
150C
TCTRIM[4:0] = 0x10000 or 0x00000 (nominal TC)
0x00001
0x00010
0x00011
0x00100
0x00101
...
0x01111
0x11111
...
0x10101
0x10100
0x10011
0x10010
0x10001
TC increases
TC decreases
