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ST6201CB1 View Datasheet(PDF) - STMicroelectronics

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ST6201CB1 Datasheet PDF : 100 Pages
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ST6200C ST6201C ST6203C
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:
Power-On RESET
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 VDD, 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
RESET
2048
CLOCK CYCLE
DELAY
INTERNAL
RESET
NMI MASK SET
INT LATCH CLEARED
(IF PRESENT)
SELECT
NMI MODE FLAGS
PUT FFEh
ON ADDRESS BUS
YES
IS RESET STILL
PRESENT?
NO
LOAD PC
FROM RESET LOCATIONS
FFEh/FFFh
VDD
R
C
Typical: R = 10K
C = 10nF
VDD
RESET
ST62xx
R > 4.7 K
FETCH INSTRUCTION
Doc ID 4563 Rev 5
25/100
1
 

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