MC68HC08XL36 Datasheet, PDF (80/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
Exiting Stop Mode
The following events restart the system clocks and load the program
counter with the reset vector or with an interrupt vector:
• External reset — A logic 0 on the RST pin resets the MCU and
loads the program counter with the contents of locations $FFFE
and $FFFF.
• External interrupt — A high-to-low transition on an external
interrupt pin loads the program counter with the contents of
locations:
– $FFFA and $FFFB (IRQ1 pin)
– $FFE0 and $FFE1 (IRQ2 pin)
– $FFDE and $FFDF (keyboard interrupt pins)
• Low-voltage inhibit (LVI) reset — A power supply voltage below
the LVI_tripf voltage resets the MCU and loads the program counter
with the contents of locations $FFFE and $FFFF.
• Break interrupt — A break interrupt loads the program counter
with the contents of locations $FFFC and $FFFD.
Upon exit from stop mode, the system clocks begin running after an
oscillator stabilization delay. A 12-bit stop recovery counter inhibits the
system clocks for 4096 CGMXCLK cycles after the reset or external
interrupt.
A mask option determines whether the oscillator stabilization delay
during stop recovery is 4096 CGMXCLK cycles or 32 CGMXCLK cycles.
NOTE: Select the mask option for the full stop recovery time of 4096 CGMXCLK
cycles in applications that use an external crystal.
MC68HC08XL36
80
Low-Power Modes
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