MC68HC912D60A MOTOROLA [Motorola, Inc], MC68HC912D60A Datasheet - Page 151

• Manufacturer Part Number: MC68HC912D60A
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

11.6.7 STOP exit in Limp Home mode without Delay (Fast Stop Recovery)
MC68HC912D60A — Rev 3.0
MOTOROLA
CAUTION:
improper EXTALi clock cycles can occur on SYSCLK. This may lead to
a code runaway.
(NOLHM=0, CME=X, DLY=0)
Fast STOP recovery refers to any exit from STOP using DLY=0.
If the NOLHM bit is cleared, then the CME (or FCME) bit is masked when
a STOP instruction is executed to prevent a clock monitor failure. When
coming out of STOP mode, the MCU goes into limp-home mode where
CME and FCME signals are asserted.
When using a crystal oscillator, it is possible to exit STOP with the DLY
bit cleared. In this case, STOP is de-asserted without delay and the MCU
will execute software in limp-home mode, giving the crystal oscillator
time to stablise.
This mode is not recommended since the risk of the clock monitor
detecting incorrect clocks is high.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Clock Functions
Limp-Home and Fast STOP Recovery modes
Clock Functions
Technical Data
151