S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
140
NXP Semiconductors
4.3.2.16
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
.
Read: Anytime
Write: Anytime
0x02F3
7
6
5
4
3
2
1
0
R
ACLKTR5
ACLKTR4
ACLKTR3
ACLKTR2
ACLKTR1
ACLKTR0
0
0
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 4-21. Autonomous Clock Trimming Register (CPMUACLKTR)
Table 4-19. CPMUACLKTR Field Descriptions
Field
Description
7–2
ACLKTR[5:0]
Autonomous Clock Period Trimming Bits
for trimming effects. The ACLKTR[5:0] value
represents a signed number influencing the ACLK period time.
Table 4-20. Trimming Effect of ACLKTR[5:0]
ACLKTR[5:0]
Decimal
ACLK frequency
100000
-32
lowest
100001
-31
increasing
....
111111
-1
000000
0
mid
000001
+1
increasing
....
011110
+30
011111
+31
highest
Содержание MC9S12VRP64
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