MCF5282CVM66 Freescale, MCF5282CVM66 Datasheet - Page 181
MCF5282CVM66
Manufacturer Part Number
MCF5282CVM66
Description
Manufacturer
Freescale
Datasheet
1.MCF5282CVM66.pdf
(766 pages)
Specifications of MCF5282CVM66
Cpu Family
MCF528x
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
66MHz
Interface Type
CAN/I2C/QSPI/UART
Total Internal Ram Size
64KB
# I/os (max)
150
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
3.3V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
256
Package Type
MA-BGA
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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The external clock is divided by two internally to produce the system clocks.
9.7.2
In external clock mode, the system is static and does not recognize reset until a clock is applied to EXTAL.
In PLL mode, the PLL operates in self-clocked mode (SCM) during reset until the input reference clock
to the PLL begins operating within the limits given in the electrical specifications.
If a PLL failure causes a reset, the system enters reset using the reference clock. Then the system clock
source changes to the PLL operating in SCM. If SCM is not functional, the system becomes static.
Alternately, if the LOCEN bit in SYNCR is cleared when the PLL fails, the system becomes static. If
external reset is asserted, the system cannot enter reset unless the PLL is capable of operating in SCM.
9.7.3
In normal PLL clock mode, the default system frequency is two times the reference frequency after reset.
The RFD[2:0] and MFD[2:0] bits in the SYNCR select the frequency multiplier.
When programming the PLL, do not exceed the maximum system clock frequency listed in the electrical
specifications. Use this procedure to accommodate the frequency overshoot that occurs when the MFD bits
are changed:
9.7.4
In PLL mode, the PLL synthesizes the system clocks. The PLL can multiply the reference clock frequency
by 2x to 9x, provided that the system clock frequency remains within the range listed in electrical
specifications. For example, if the reference frequency is 2 MHz, the PLL can synthesize frequencies of 4
MHz to 18 MHz. In addition, the RFD can reduce the system frequency by dividing the output of the PLL.
Freescale Semiconductor
1. Determine the appropriate value for the MFD and RFD fields in the SYNCR. The amount of jitter
2. Write a value of RFD (from step 1) + 1 to the RFD field of the SYNCR.
3. Write the MFD value from step 1 to the SYNCR.
4. Monitor the LOCK flag in SYNSR. When the PLL achieves lock, write the RFD value from step
in the system clocks can be minimized by selecting the maximum MFD factor that can be paired
with an RFD factor to provide the required frequency.
1 to the RFD field of the SYNCR. This changes the system clocks frequency to the required
frequency.
Clock Operation During Reset
System Clock Generation
PLL Operation
1
XTAL must be tied low in external clock mode when reset is asserted. If it
is not, clocks could be suspended indefinitely.
Keep the maximum system clock frequency below the limit given in the
Electrical Characteristics.
f
f
MFD ranges from 0 to 7.
RFD ranges from 0 to 7.
ref
sys
= input reference frequency
= CLKOUT frequency
CAUTION
NOTE
Clock Module
9-11
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