mc68hc912d60c Freescale Semiconductor, Inc, mc68hc912d60c Datasheet - Page 151
mc68hc912d60c
Manufacturer Part Number
mc68hc912d60c
Description
Hc12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC912D60C.pdf
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11.6.7 STOP exit in Limp Home mode without Delay (Fast Stop Recovery)
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
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.
Clock Functions
Limp-Home and Fast STOP Recovery modes
Clock Functions
Technical Data
151
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