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USER’S GUIDE
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10
Watchdog Timer
When the user’s software is being executed, the Watch-
dog Timer can be used to automatically restart the pro-
cessor in the event that software control is lost. It is also
used to generate an oscillator start–up delay to allow the
clock frequency to stabilize. This occurs during reset
cycles that follow a time in which the oscillator has been
stopped (Stop Mode Reset and Power On Reset).
Resident Loader ROM
The Resident Loader ROM contains firmware that con-
trols the initial loading of the nonvolatile Program/Data
RAM. The firmware provides Serial Bootstrap Load op-
eration via the on–chip serial port. The internal ROM is
not accessible by the user and performs the loading
function only when the device is strapped for operation
in the Program mode. The ROM becomes transparent
to the user once loading is complete and has no effect
on the memory map.