MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 246

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Clock Module
11.4.4.2 Stop Mode
Advance Information
246
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
risk 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 OSC startup or
PLL lock.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Clock Module
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA