ST72334J datasheet(27/125 Pages) STMICROELECTRONICS

Numer części	ST72334J

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

PDF	125 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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27 / 125 page

ST72334J/N, ST72314J/N, ST72124J

27/125

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.

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.

Figure 16. External RESET Sequences

RESET

RUN

DELAY

INTERNAL RESET

4096 CLOCK CYCLES

FETCH

VECTOR

RUN

RESET PIN

EXTERNAL RESET SOURCE

tPULSE

VDD

VLVDf

VDDnominal

WATCHDOG RESET

RESET

RUN

INTERNAL RESET

4096 CLOCK CYCLES

FETCH

VECTOR

RUN

RESET PIN

EXTERNAL RESET SOURCE

tPULSE

WATCHDOG RESET

DELAY

VDD

VLVDf

VDDnominal

tDELAYmin

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