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ST72F321BJ7TCRE Datasheet(PDF) 44 Page - STMicroelectronics

Part # ST72F321BJ7TCRE
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
PDF  247 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72F321BJ7TCRE Datasheet(HTML) 44 Page - STMicroelectronics

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Supply, reset and clock management
ST72321Bxxx-Auto
44/247
6
Supply, reset and clock management
6.1
Introduction
The device includes a range of utility features for securing the application in critical
situations (for example in case of a power brown-out), and reducing the number of external
components. An overview is shown in Figure 9.
For more details, refer to the dedicated parametric section.
6.2
Main features
●
Optional PLL for multiplying the frequency by 2 (not to be used with internal RC
oscillator)
●
Reset Sequence Manager (RSM)
●
Multi-oscillator Clock Management (MO)
–
5 crystal/ceramic resonator oscillators
–
1 internal RC oscillator
●
System Integrity Management (SI)
–
Main supply low voltage detection (LVD)
–
Auxiliary voltage detector (AVD) with interrupt capability for monitoring the main
supply or the EVD pin
Figure 9.
Clock, reset and supply block diagram
LOW VOLTAGE
DETECTOR
(LVD)
fOSC2
AUXILIARY VOLTAGE
DETECTOR
(AVD)
MULTI-
OSCILLATOR
(MO)
OSC1
RESET
VSS
EVD
VDD
RESET SEQUENCE
MANAGER
(RSM)
OSC2
MAIN CLOCK
AVD Interrupt Request
CONTROLLER
PLL
SYSTEM INTEGRITY MANAGEMENT
WATCHDOG
SICSR
TIMER (WDG)
WITH REAL-TIME
CLOCK (MCC/RTC)
AVD AVD AVD LVD
RF
IE
WDG
RF
0
1
fOSC
(option)
0
S
F
fCPU
00



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