ST72314J2B7 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72314J2B7

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

STMicroelectronics 

ST72334J/N, ST72314J/N, ST72124J

RESET SEQUENCE MANAGER (Cont’d)

External RESET pin

The RESET pin is both an input and an open-drain

output with integrated RON weak pull-up resistor.

This pull-up has no fixed value but varies in ac-

cordance with the input voltage. It can be pulled

low by external circuitry to reset the device.

Figure 16. External RESET Sequences

VDDnominal

VLVDf

VDD

A RESET signal originating from an external

source must have a duration of at least tPULSE in

order to be recognized. Two RESET sequences

can be associated with this RESET source as

shown in Figure 16.

Starting from the external RESET pulse recogni-

tion, the device RESET pin acts as an output that

is pulled low during at least tDELAYmin.

RUN

t PUL SE

RESET

DELAY

INTERNAL RESET FETCH

4096 CLOCK CYCLES VECTOR

tDE LAYmin

RUN

EXTERNAL RESET SOURCE

RESET PIN

VDDnominal

VLVDf

VDD

RUN

t PUL SE

WATCHDOG RESET

DELAY

RESET

INTERNAL RESET FETCH

4096 CLOCK CYCLES VECTOR

RUN

EXTERNAL RESET SOURCE

RESET PIN

WATCHDOG RESET

27/125

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