MC68HC705C9A Datasheet, PDF (44/118 Pages) Motorola, Inc – Microcontrollers

Resets
5.9.2 STOP Instruction Disable Option
On the ROM device MC68HC05C12A, stop mode can be disabled by mask option. This causes the CPU
to interpret the STOP instruction as a NOP so the device will never enter stop mode; if the user code is
not being executed properly, the COP will provide a system reset.
To emulate this feature on the MC68HC705C9A (configured as an MC68HC05C12A), set the STOPDIS
bit in the C12MOR. Stop mode will not actually be disabled as on the MC68HC05C12A, but the clock
monitor circuit will be activated. If the CPU executes a STOP instruction, the clock monitor will provide a
system reset.
NOTE
This feature cannot be used with operating frequencies of 200 kHz or less.
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
44
Freescale Semiconductor