ST72334N2B7(2003) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72334N2B7
(Rev.:2003)

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES

STMicroelectronics 

ST72334J/N, ST72314J/N, ST72124J

9 SUPPLY, RESET AND CLOCK MANAGEMENT

The ST72334J/N, ST72314J/N and ST72124J mi-

crocontrollers include a range of utility features for

securing the application in critical situations (for

example in case of a power brown-out), and re-

ducing the number of external components. An

overview is shown in Figure 12.

See Section 16 "ELECTRICAL CHARACTERIS-

TICS" on page 107 for more details.

s Multi-Oscillator (MO)

– 4 Crystal/Ceramic resonator oscillators

– 1 External RC oscillator

– 1 Internal RC oscillator

s Clock Security System (CSS)

– Clock Filter

– Backup Safe Oscillator

Main Features

s Supply Manager with main supply low voltage

detection (LVD)

s Reset Sequence Manager (RSM)

Figure 12. Clock, Reset and Supply Block Diagram

OSC2

OSC1

RESET

VDD

VSS

MULTI-

OSCILLATOR

(MO)

CLOCK SECURITY SYSTEM

(CSS)

CLOCK

FILTER

SAFE

OSC

fOSC

TO

MAIN CLOCK

CONTROLLER

RESET SEQUENCE

MANAGER

(RSM)

FROM

WATCHDOG

PERIPHERAL

LOW VOLTAGE

DETECTOR

(LVD)

LVD

CSS WDG

CRSR 0

0

0 RF 0 IE D RF

CSS INTERRUPT

26/153

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