ST72321BR9-AUTO View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72321BR9-AUTO

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

STMicroelectronics 

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Supply, reset and clock management

ST72321Bxxx-Auto

multi-oscillator, the resonator and the load capacitors have to be placed as close as possible

to the oscillator pins in order to minimize output distortion and start-up stabilization time.

The loading capacitance values must be adjusted according to the selected oscillator.

These oscillators are not stopped during the RESET phase to avoid losing time in the

oscillator start-up phase.

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 9.

ST7 clock sources

Hardware configuration

ST7

OSC1

OSC2

EXTERNAL

SOURCE

ST7

OSC1

OSC2

CL1

CL2

LOAD

CAPACITORS

ST7

OSC1

OSC2

6.5

6.5.1

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Reset sequence manager (RSM)

Introduction

The reset sequence manager includes three RESET sources as shown in Figure 11:

● 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.

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