MC68HC05X16 Datasheet, PDF (139/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
10.1.4.1 COP watchdog during STOP mode
The STOP instruction is inhibited when the watchdog system is enabled. If a STOP instruction is
executed while the watchdog system is enabled, then a watchdog reset will occur as if there were
a watchdog timeout. In the case of a watchdog reset due to a STOP instruction, the oscillator will
not be affected, thus there will be no t_PORL cycles start-up delay. On start-up, the watchdog will be
configured according to the user specified mask option.
10.1.4.2 COP watchdog during WAIT mode
The state of the watchdog during WAIT mode is selected via a mask option (see Section 1.2) to
be one of the options below:
Watchdog enabled — the watchdog counter will continue to operate during WAIT mode and a reset
will occur after time t_DOG.
Watchdog disabled — on entering WAIT mode, the watchdog counter system is reset and
disabled. On exiting WAIT mode the counter resumes normal operation.
10.1.5 Functions affected by reset
When processing stops within the MCU for any reason, i.e. power-on reset, external reset or the
execution of a STOP or WAIT instruction, various internal functions of the MCU are affected.
Table 10-1 shows the resulting action of any type of system reset, but not necessarily in the order
in which they occur.
Note:
Reset action on individual MCAN registers is described in Section 5 and is also
summarised in Table 3-2.
10
MC68HC05X16
RESETS AND INTERRUPTS
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