ST72104G, ST72215G, ST72216G, ST72254G
7 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 14 "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
MCO
CLOCK SECURITY SYSTEM
(CSS)
MAIN CLOCK
CONTROLLER
(MCC)
MULTI-
OSCILLATOR
(MO)
f
f
CPU
OSC2
OSC1
OSC
CLOCK
FILTER
SAFE
OSC
RESET SEQUENCE
MANAGER
FROM
RESET
WATCHDOG
PERIPHERAL
(RSM)
VDD
VSS
LOW VOLTAGE
DETECTOR
(LVD)
LVD
CSS
WDG
RF
CRSR
0
0
0
RF
0
IE
D
CSS INTERRUPT
17/140
ETC [ ETC ]
