ST72324BL View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72324BL

3V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE

STMicroelectronics 

ST72F324L, ST72324BL

6 SUPPLY, RESET AND CLOCK MANAGEMENT

The device includes a range of utility features for

securing the application in critical situations (for

example in case of a power brown-out), and re-

ducing the number of external components. An

overview is shown in Figure 10.

For more details, refer to dedicated parametric

section.

Main features

■ Optional PLL for multiplying the frequency by 2

(not to be used with internal RC oscillator)

■ Reset Sequence Manager (RSM)

■ Multi-Oscillator Clock Management (MO)

– 5 Crystal/Ceramic resonator oscillators

– 1 Internal RC oscillator

6.1 PHASE LOCKED LOOP

If the clock frequency input to the PLL is in the

range 2 to 4 MHz, the PLL can be used to multiply

the frequency by two to obtain an fOSC2 of 4 to 8

MHz. The PLL is enabled by option byte. If the PLL

is disabled, then fOSC2 = fOSC/2.

Caution: The PLL is not recommended for appli-

cations where timing accuracy is required. See

Section 6.1 on page 22.

Caution: The PLL must not be used with the inter-

nal RC oscillator.

Figure 10. Clock, Reset and Supply Block Diagram

OSC2

OSC1

RESET

MULTI-

fOSC

OSCILLATOR

(MO)

PLL Block

PLL x 2

/2

0

fOSC2

1

MAIN CLOCK

CONTROLLER

WITH REALTIME

CLOCK (MCC/RTC)

fCPU

PLL OPTION BIT

RESET SEQUENCE

MANAGER

(RSM)

WATCHDOG

TIMER (WDG)

22/151

1

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