S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
119
4.3.2
Register Descriptions
This section describes all the S12CPMU_UHV_V8 registers and their individual bits.
Address order is as listed in
4.3.2.1
S12CPMU_UHV_V8 Synthesizer Register (CPMUSYNR)
The CPMUSYNR register controls the multiplication factor of the PLL and selects the VCO frequency
range.
Read: Anytime
Write: If PROT=0 (CPMUPROT register) and PLLSEL=1 (CPMUCLKS register), then write anytime.
Else write has no effect.
NOTE
Writing to this register clears the LOCK and UPOSC status bits.
NOTE
f
VCO
must be within the specified VCO frequency lock range. Bus
frequency f
bus
must not exceed the specified maximum.
The VCOFRQ[1:0] bits are used to configure the VCO gain for optimal stability and lock time. For correct
PLL operation the VCOFRQ[1:0] bits have to be selected according to the actual target VCOCLK
frequency as shown in
. Setting the VCOFRQ[1:0] bits incorrectly can result in a non functional
PLL (no locking and/or insufficient stability).
0x0034
7
6
5
4
3
2
1
0
R
VCOFRQ[1:0]
SYNDIV[5:0]
W
Reset
0
1
0
1
1
0
0
0
Figure 4-4. S12CPMU_UHV_V8 Synthesizer Register (CPMUSYNR)
Table 4-2. VCO Clock Frequency Selection
VCOCLK Frequency Ranges
VCOFRQ[1:0]
32MHz <= f
VCO
<= 48MHz
00
48MHz < f
VCO
<= 50MHz
01
Reserved
10
Reserved
11
fVCO 2 fREF
SYNDIV 1
+
=
If PLL has locked (LOCK=1)
Содержание MC9S12VRP64
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