ST72F324K2TCRS View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72F324K2TCRS

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

ST72324xx-Auto

Figure 10. Clock, reset and supply block diagram

Supply, reset and clock management

OSC2

OSC1

Multi-

oscillator

(MO)

fOSC PLL

(option)

fOSC2

System Integrity Management

Main Clock

Controller

fCPU

with Real-time

Clock (MCC/RTC)

RESET

Reset Sequence

Manager

(RSM)

AVD Interrupt Request

SICSR

0

AVD AVD LVD

IE F RF

0

0

0

WDG

RF

Watchdog

Timer (WDG)

t(s) Low Voltage

c VSS

Detector

u VDD

(LVD)

rod Auxiliary Voltage

P Detector

te (AVD)

- Obsole 6.3

Obsolete Product(s) Caution:

Multi-oscillator (MO)

The main clock of the ST7 can be generated by three different source types coming from the

multi-oscillator block:

● an external source

● 4 crystal or ceramic resonator oscillators

● an internal high frequency RC oscillator

Each oscillator is optimized for a given frequency range in terms of consumption and is

selectable through the option byte. The associated hardware configurations are shown in

Table 9. Refer to the Electrical characteristics section for more details.

The OSC1 and/or OSC2 pins must not be left unconnected. For the purposes of Failure

Mode and Effect Analysis, it should be noted that if the OSC1 and/or OSC2 pins are left

unconnected, the ST7 main oscillator may start and, in this configuration, could generate an

fOSC clock frequency in excess of the allowed maximum (> 16 MHz), putting the ST7 in an

unsafe/undefined state. The product behavior must therefore be considered undefined when

the OSC pins are left unconnected.

6.3.1

External clock source

In this external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle

has to drive the OSC1 pin while the OSC2 pin is tied to ground.

Doc ID 13841 Rev 1

33/193

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