ST72321R9-Auto datasheet(45/243 Pages) STMICROELECTRONICS

部件名	ST72321R9-Auto

功能描述	PLL for 2x frequency multiplication

PDF	243 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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45 / 243 page

ST72321xx-Auto

Supply, reset and clock management

Doc ID 13829 Rev 1

45/243

Figure 15.

Using the AVD to monitor VDD (AVDS bit = 0)

Monitoring a voltage on the EVD pin

This mode is selected by setting the AVDS bit in the SICSR register.

The AVD circuitry can generate an interrupt when the AVDIE bit of the SICSR register is set.

This interrupt is generated on the rising and falling edges of the comparator output. This

means it is generated when either one of these two events occur:

●

VEVD rises up to VIT+(EVD)

●

VEVD falls down to VIT-(EVD)

The EVD function is illustrated in Figure 16.

For more details, refer to Section 19: Electrical characteristics.

VDD

VIT+(AVD)

VIT-(AVD)

AVDF bit

RESET VALUE

IF AVDIE bit = 1

Vhyst

AVD INTERRUPT

REQUEST

INTERRUPT PROCESS

VIT+(LVD)

VIT-(LVD)

LVD RESET

Early Warning Interrupt

(Power has dropped, MCU not

not yet in reset)

trv VOLTAGE RISE TIME

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