ST72589BW datasheet(17/158 Pages) STMICROELECTRONICS

Part #	ST72589BW

Description	8-BIT MCU WITH NESTED INTERRUPTS, DOT MATRIX LCD, ADC, TIMERS, PWM-BRM, SPI, SCI, I²C, CAN INTERFACES

PDF	158 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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17 / 158 page

ST72589BW, ST72389BW

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3.1 RESET MANAGER

3.1.1 Introduction

There are three sources of Reset:

– RESET pin (external source)

– Power-On Reset (internal source)

– WATCHDOG (internal source)

The Reset Service Routine vector is located at ad-

dress FFFEh-FFFFh.

Figure 7. Reset Block Diagram

3.1.2 External Reset

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

output with integrated RON weak pull-up resistor

(see Figure 7). This pull-up has not a fixed value

but varies in accordance 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. The RESET sequence as-

sociated to this RESET source is shown in Figure

When the RESET is generated by a internal

source, during the two first phases of the RESET

sequence, the device RESET pin acts as an out-

put that is pulled low.

Figure 8. External RESET Sequences

fCPU

RESET

RON

VDD

WATCHDOG RESET

POR

INTERNAL

RESET

RUN

INTERNAL RESET

4096 CLOCK CYCLES

FETCH

VECTOR

RUN

RESET PIN

EXTERNAL RESET SOURCE

tPULSE

WATCHDOG RESET

DELAY

ST72589BW Datasheet(PDF) 17 Page - STMicroelectronics

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