SAB80C515A-5 SIEMENS [Siemens Semiconductor Group], SAB80C515A-5 Datasheet - Page 26

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SAB80C515A-5

Manufacturer Part Number
SAB80C515A-5
Description
8-Bit CMOS Single-Chip Microcontroller Family
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
The power down state is maintained while pin HWPD is held active. If HWPD goes to high level
(inactive state) an automatic start up procedure is performed:
The SWD-Function of the PE/SWD Pin is sampled only by a hardware reset.Therefore at least one
Power On Reset has to be performed.
Semiconductor Group
– First the pins leave their floating condition and enter their default reset state as they had
– Both oscillators are enabled. While the on-chip oscillator (with pins XTAL1 and XTAL2)
– Because the oscillator watchdog is active it detects a failure condition if the on-chip oscillator
– Finally, when the on-chip oscillator has started, the oscillator watchdog releases the part from
immediately before going to float state.
usually needs a longer time for start-up, if not externally driven (with crystal approx. 1 ms), the
oscillator watchdog's RC oscillator has a very short start-up time (typ. less than 2
microseconds).
hasn't yet started. Hence, the watchdog keeps the part in reset and supplies the internal clock
from the RC oscillator.
reset after it performed a final internal reset sequence and switches the clock supply to the on-
chip oscillator. This is exactly the same procedure as when the oscillator watchdog detects
first a failure and then a recovering of the oscillator during normal operation. Therefore, also
the oscillator watchdog status flag is set after restart from Hardware Power Down Mode.
When automatic start of the watchdog was enabled (PE/SWD connected to
Watchdog Timer will start, too (with its default reload value for time-out period).
4-3
System Reset
V
CC
), the

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