Freescale Semiconductor, Inc.
Clock Functions
(NOLHM=1, CME=0, DLY=0)
If NOLHM is set to 1 and the CME and FCME bits are cleared, the limp
home clock is not used. In this mode, crystal activity is the only method
by which the device may recover from Pseudo-STOP. The device will
start execution with the EXTALi clock following 16 XCLK cycles.
CAUTION: Due to switching of the clock this configuration is not recommended.
12.6.13 Summary of STOP and pseudo-STOP Mode Exit Conditions
Table 12-1 and Table 12-2 summarise the exit conditions from STOP
and pseudo-STOP modes using Interrupt, Key-interrupt and XIRQ.
A short RESET pulse should not be used to exit stop or pseudo-STOP
mode because Limp Home mode is automatically entered after RESET
(when V
=V ). The RESET wakeup pulse must be longer than the
DD
DDPLL
oscillator startup time (as in power on reset) in order to remove the risk
of code runaway.
Advance Information
160
68HC(9)12D60 — Rev 4.0
Clock Functions
MOTOROLA
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MOTOROLA [ MOTOROLA ]
