Specifications

ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx
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6 SUPPLY, RESET AND CLOCK MANAGEMENT
The ST72104G, ST72215G, ST72216G and
ST72254G microcontrollers include a range of util
-
ity features for securing the application in critical
situations (for example in case of a power brown-
out), and reducing the number of external compo
-
nents. An overview is shown in Figure 8.
See Section 13 "ELECTRICAL CHARACTERIS-
TICS" on page 96 for more details.
Main Features
■ Supply Manager with main supply low voltage
detection (LVD)
■ Reset Sequence Manager (RSM)
■ Multi-Oscillator (MO)
– 4 Crystal/Ceramic resonator oscillators
– 1 External RC oscillator
– 1 Internal RC oscillator
■ Clock Security System (CSS)
– Clock Filter
– Backup Safe Oscillator
Figure 8. Clock, Reset and Supply Block Diagram
IE D00 0 0 RF RF
CRSR
CSS WDG
f
OSC
CSS INTERRUPT
LVD
LOW VOLTAGE
DETECTOR
(LVD)
MULTI-
OSCILLATOR
(MO)
FROM
WATCHDOG
PERIPHERAL
OSC1
RESET
VDD
VSS
RESET SEQUENCE
MANAGER
(RSM)
CLOCK
FILTER
SAFE
OSC
CLOCK SECURITY SYSTEM
(CSS)
MAIN CLOCK
CONTROLLER
(MCC)
MCO
f
CPU
OSC2