mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 162
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mc9s12vr48
Manufacturer Part Number
mc9s12vr48
Description
S12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12VR48.pdf
(592 pages)
- Current page: 162 of 592
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Clock, Reset and Power Management (S12CPMU_UHV)
4.4
4.4.1
The PLL is used to generate a high speed PLLCLK based on a low frequency REFCLK.
The REFCLK is by default the IRCCLK which is trimmed to f
If using the oscillator (OSCE=1) REFCLK will be based on OSCCLK. For increased flexibility, OSCCLK
can be divided in a range of 1 to 16 to generate the reference frequency REFCLK using the REFDIV[3:0]
bits. Based on the SYNDIV[5:0] bits the PLL generates the VCOCLK by multiplying the reference clock
by a 2, 4, 6,... 126, 128. Based on the POSTDIV[4:0] bits the VCOCLK can be divided in a range of 1,2,
3, 4, 5, 6,... to 32 to generate the PLLCLK.
162
.
If oscillator is enabled (OSCE=1)
If oscillator is disabled (OSCE=0)
f VCO
If PLL is locked (LOCK=1)
If PLL is not locked (LOCK=0)
If PLL is selected (PLLSEL=1)
Functional Description
=
Phase Locked Loop with Internal Filter (PLL)
2 f REF
×
Although it is possible to set the dividers to command a very high clock
frequency, do not exceed the specified bus frequency limit for the MCU.
×
(
SYNDIV
+
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
f PLL
f bus
1
f PLL
)
=
=
=
f REF
f REF
f PLL
------------ -
---------------------------------------- -
(
f VCO
---------------
POSTDIV
2
4
=
=
f VCO
------------------------------------
(
f IRC1M
REFDIV
NOTE
f OSC
+
1
)
+
1
)
IRC1M_TRIM
Rev. 2.2
=1MHz.
Freescale Semiconductor
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