ST72325AR9-Auto datasheet(44/243 Pages) STMICROELECTRONICS

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Supply, reset and clock management

ST72325xxx-Auto

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Doc ID 13770 Rev 3

Internal RC oscillator

This oscillator allows a low cost solution for the main clock of the ST7 using only an internal

resistor and capacitor. Internal RC oscillator mode has the drawback of a lower frequency

accuracy and should not be used in applications that require accurate timing.

In this mode, the two oscillator pins have to be tied to ground.

Table 11.

ST7 clock sources

6.5

Reset sequence manager (RSM)

6.5.1

Introduction

The reset sequence manager includes three RESET sources as shown in Figure 12:

●

External RESET source pulse

●

Internal LVD RESET (low voltage detection)

●

Internal WATCHDOG RESET

These sources act on the RESET pin and it is always kept low during the delay phase.

The RESET service routine vector is fixed at addresses FFFEh-FFFFh in the ST7 memory

map.

Hardware configuration

OSC1

OSC2

EXTERNAL

ST7

SOURCE

OSC1

OSC2

LOAD

CAPACITORS

ST7

CL2

CL1

OSC1

OSC2

ST7

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