ST72321BXXX-AUTO datasheet(49/247 Pages) STMICROELECTRONICS

Part #	ST72321BXXX-AUTO

Description	8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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49 / 247 page

ST72321Bxxx-Auto

Supply, reset and clock management

49/247

Figure 13.

RESET sequences

6.6

System integrity management (SI)

The System Integrity Management block contains the Low Voltage Detector (LVD) and

Auxiliary Voltage Detector (AVD) functions. It is managed by the SICSR register.

6.6.1

Low voltage detector (LVD)

The low voltage detector function (LVD) generates a static reset when the VDD supply

voltage is below a VIT- reference value. This means that it secures the power-up as well as

the power-down keeping the ST7 in reset.

The VIT- reference value for a voltage drop is lower than the VIT+ reference value for power-

on in order to avoid a parasitic reset when the MCU starts running and sinks current on the

supply (hysteresis).

The LVD reset circuitry generates a reset when VDD is below:

–VIT+ when VDD is rising

–VIT- when VDD is falling

The LVD function is illustrated in Figure 14.

The voltage threshold can be configured by option byte to be low, medium or high.

VDD

RUN

RESET PIN

EXTERNAL

WATCHDOG

Active Phase

VIT+(LVD)

VIT-(LVD)

th(RSTL)in

tw(RSTL)out

RUN

th(RSTL)in

Active

WATCHDOG UNDERFLOW

tw(RSTL)out

RUN

RESET

SOURCE

SHORT EXT.

RESET

LVD

RESET

LONG EXT.

RESET

WATCHDOG

RESET

INTERNAL RESET (256 or 4096 TCPU)

VECTOR FETCH

tw(RSTL)out

Phase

Active

Phase

Active

Phase

DELAY

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ST72321BXXX-AUTO Datasheet(PDF) 49 Page - STMicroelectronics

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