MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 224

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

• Lead Free Status / RoHS Status: Not Compliant

Clock Module
10.4.4.2 Stop Mode
10.5 Block Diagram
Technical Data
224
EXTAL
OSCILLATOR
XTAL
In stop mode, all system clocks are disabled. There are several options
for enabling/disabling the PLL and/or crystal oscillator in stop mode at
the price of increased wakeup recovery time. The PLL can be disabled
in stop mode, but then it requires a wakeup period before it can relock.
The OSC can also be disabled during stop mode, but then it requires a
wakeup period to restart.
When the PLL is enabled in stop mode (STPMD[1:0]), the external
CLKOUT signal can support systems using CLKOUT as the clock
source.
There is also a fast wakeup option for quickly enabling the system clocks
during stop recovery. This eliminates the wakeup recovery time but at a
price of sending a potentially unstable clock to the system. To prevent a
non-locked PLL frequency overshoot when using the fast wakeup
option, change the RFD divisor to the current RFD value plus one before
entering stop mode.
In external clock mode, there are no wakeup periods for oscillator startup
or PLL lock.
Figure 10-1. Clock Module Block Diagram
Freescale Semiconductor, Inc.
REFERENCE CLOCK
For More Information On This Product,
Go to: www.freescale.com
V
DDSYN
Clock Module
CLKGEN
DISCLK
V
SSSYN
PLL
RSTOUT
VCO CLKOUT
INTERNAL CLOCKS
MMC2107 – Rev. 2.0
RFD
MOTOROLA
CLKOUT