mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 167

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

11.6.4 STOP exit without Limp Home mode, clock monitor disabled
MC68HC912DG128 — Rev 3.0
MOTOROLA
EXTALi
Clock Monitor Fail
Limp-Home
13-stage counter
(Clocked by XCLK)
BCSP
STOP (DLY = 1)
STOP (DLY = 0)
SYSCLK
NOTE:
Figure 11-5. STOP Exit and Fast STOP Recovery
(NOLHM=1, CME=0, DLY=X)
If Limp home mode is disabled (V
CME (or FCME) bit is cleared, the MCU goes into STOP mode when a
STOP instruction is executed.
If EXTALi clock is present then exit from STOP will occur normally using
this clock. Under this condition, DLY should always be set to allow the
crystal to stabilise and minimise the risk of code runaway. With DLY=1
execution resumes after a delay of 4096 XCLK cycles.
The external clock signal should stabilise within the 4096 reset counter
cycles. Use of DLY=0 is not recommended due to this requirement.
Freescale Semiconductor, Inc.
0 --> 4096
PLLCLK (L.H.)
For More Information On This Product,
Go to: www.freescale.com
Clock Functions
Restore PLLCLK or EXTALi
Restore BCSP
DDPLL
Limp-Home and Fast STOP Recovery modes
=V
SS
or NOLHM bit set) and the
Clock Functions
Technical Data
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