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ST6215C Datasheet(PDF) 26 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST6215C Datasheet(HTML) 26 Page - STMicroelectronics

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RESET (Cont’d)
5.3.4 Watchdog Reset
The MCU provides a Watchdog timer function in
order to be able to recover from software hang-
ups. If the Watchdog register is not refreshed be-
fore an end-of-count condition is reached, a
Watchdog reset is generated.
After a Watchdog reset, the MCU restarts in the
same way as if a Reset was generated by the RE-
SET pin.
Note: When a watchdog reset occurs, the RESET
pin is tied low for very short time period, to flag the
reset phase. This time is not long enough to reset
external circuits.
For more details refer to the Watchdog Timer
chapter.
5.3.5 LVD Reset
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
s
Power-On RESET
s
Voltage Drop RESET
During an LVD reset, the RESET pin is pulled low
when VDD<VIT+ (rising edge) or VDD<VIT- (falling
edge).
For more details, refer to the LVD chapter.
Caution: Do not externally connect directly the
RESET pin to V
DD, this may cause damage to the
component in case of internal RESET (Watchdog
or LVD).
Figure 15. Simple External Reset Circuitry
Figure 16. Reset Processing
ST62xx
RESET
VDD
VDD
R
C
Typical: R = 10K
C = 10nF
R > 4.7 K
INT LATCH CLEARED
NMI MASK SET
(IF PRESENT)
SELECT
NMI MODE FLAGS
IS RESET STILL
PRESENT?
YES
PUT FFEh
ON ADDRESS BUS
FROM RESET LOCATIONS
FFEh/FFFh
NO
FETCH INSTRUCTION
LOAD PC
INTERNAL
RESET
RESET
2048
CLOCK CYCLE
DELAY
1


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