MC68HC912DG128 Datasheet, PDF (164/452 Pages) Motorola, Inc – Microcontrollers

Clock Functions
Freescale Semiconductor, Inc.
Therefore, if the MCU is powered up without an external clock, limp-
home mode is entered provided the MCU is in a normal mode of
operation.
VDD
Power-On Detector
EXTALi
Clock Monitor Fail
(Slow EXTALi)
Limp-Home
13-stage counter
(Clocked by XCLK)
BCSP
Internal reset
0 --> 4096
0 --> 4096
Reset: BCSP = 0
SYSCLK
PLLCLK (L.H.)
EXTALi
SYSCLK
(Slow EXTALi)
PLLCLK (Software check of Limp-Home Flag)
Figure 11-4. No Clock at Power-On Reset
EXTALi
Technical Data
164
MC68HC912DG128 — Rev 3.0
Clock Functions
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