S9S12G128F0MLL Datasheet, PDF (391/1292 Pages) Freescale Semiconductor, Inc – Reference Manual and Date Sheet

S12 Clock, Reset and Power Management Unit (S12CPMU)
10.3.2.15 Autonomous Clock Trimming Register (CPMUACLKTR)
The CPMUACLKTR register configures the trimming of the Autonomous Clock (ACLK - trimmable
internal RC-Oscillator) which can be selected as clock source for some CPMU features.
0x02F3
7
6
5
4
3
2
1
0
R
0
0
ACLKTR5 ACLKTR4 ACLKTR3 ACLKTR2 ACLKTR1 ACLKTR0
W
Reset
F
F
F
F
F
F
0
0
After de-assert of System Reset a value is automatically loaded from the Flash memory.
Figure 10-19. Autonomous Periodical Interrupt Trimming Register (CPMUACLKTR)
Read: Anytime
Write: Anytime
Table 10-17. CPMUACLKTR Field Descriptions
Field
Description
7–2
Autonomous Clock Trimming Bits — See Table 10-18 for trimming effects. The ACLKTR[5:0] value
ACLKTR[5:0] represents a signed number influencing the ACLK period time.
Table 10-18. Trimming Effect of ACLKTR
Bit
ACLKTR[5]
ACLKTR[4]
ACLKTR[3]
ACLKTR[2]
ACLKTR[1]
ACLKTR[0]
Trimming Effect
Increases period
Decreases period less than ACLKTR[5] increased it
Decreases period less than ACLKTR[4]
Decreases period less than ACLKTR[3]
Decreases period less than ACLKTR[2]
Decreases period less than ACLKTR[1]
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
393