MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 235

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

• Lead Free Status / RoHS Status: Not Compliant

10.8 Functional Description
10.8.1 System Clock Modes
MMC2107 – Rev. 2.0
MOTOROLA
CAUTION:
This subsection provides a functional description of the clock module.
The system clock source is determined during reset. The value of
V
after reset is negated. If V
power-on reset, the internal clocks may glitch as the clock source is
changed between external clock mode and PLL clock mode. Whenever
V
Table 10-6
relationships for the possible clock modes.
XTAL must be tied low in external clock mode when reset is asserted. If
it is not, clocks could be suspended indefinitely.
The external clock is divided by two internally to produce the system
clocks.
1. f
DDSYN
DDSYN
Normal PLL clock mode
1:1 PLL clock mode
External clock mode
Freescale Semiconductor, Inc.
f
MFD ranges from 0 to 7.
RFD ranges from 0 to 7.
ref
sys
For More Information On This Product,
= input reference frequency
= CLKOUT frequency
is latched during reset and is expected to remain at that state
is changed in reset, an immediate loss of lock condition occurs.
Table 10-6. Clock-Out and Clock-In Relationships
Clock Mode
shows the clock-out frequency to clock-in frequency
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Clock Module
DDSYN
is changed during a reset other than
f
f
f
sys
sys
sys
= f
= f
= f
ref
ref
ref
/2
(MFD + 2)/2
PLL Options
Functional Description
RFD
(1)
Technical Data
Clock Module
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