ST72321BXXX-AUTO datasheet(51/247 Pages) STMICROELECTRONICS

Part #	ST72321BXXX-AUTO

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

Download	247 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

51 / 247 page

ST72321Bxxx-Auto

Supply, reset and clock management

51/247

In the case of a drop in voltage, the AVD interrupt acts as an early warning, allowing

software to shut down safely before the LVD resets the microcontroller. See Figure 15.

The interrupt on the rising edge is used to inform the application that the VDD warning state

is over.

If the voltage rise time trv is less than 256 or 4096 CPU cycles (depending on the reset delay

selected by option byte), no AVD interrupt will be generated when VIT+(AVD) is reached.

If trv is greater than 256 or 4096 cycles

●

two AVD interrupts will be received if the AVD interrupt is enabled before the VIT+(AVD)

threshold is reached: the first when the AVDIE bit is set, and the second when the

threshold is reached.

●

only one AVD interrupt will occur if the AVD interrupt is enabled after the VIT+(AVD)

threshold is reached.

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 Chapter 19: Electrical characteristics.

VDD

VIT+(AVD)

VIT-(AVD)

AVDF bit

0

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)

1

trv VOLTAGE RISE TIME

Similar Part No. - ST72321BXXX-AUTO

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72321B	3Mb / 187P	64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface
	ST72321B-D	220Kb / 6P	Raisonances complete, low-cost starter kits for STM8 and ST7
	ST72321B-DRAIS	220Kb / 6P	Raisonances complete, low-cost starter kits for STM8 and ST7
	ST72321BARx	2Mb / 187P	32K to 60K dual voltage High Density Flash October 2008 Rev 5
	ST72321BJx	2Mb / 187P	32K to 60K dual voltage High Density Flash October 2008 Rev 5

More results

Similar Description - ST72321BXXX-AUTO

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72325	3Mb / 196P	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface
	ST72325XX	3Mb / 197P	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface
	ST7232A	1Mb / 154P	8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
	ST72F321	3Mb / 189P	64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72321M6	2Mb / 175P	80-pin 8-bit MCU with 32 to 60 Kbytes Flash, ADC, five timers, SPI, SCI, I2C interface
	ST72321	4Mb / 189P	64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC,FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72321B	3Mb / 187P	64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface
	ST72325	1Mb / 193P	8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72321J	2Mb / 179P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, 5 TIMERS, SPI, SCI, I2C INTERFACE July 2003 Rev. 1.8
	ST72F521R6TA	3Mb / 215P	80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

More results

ST72321BXXX-AUTO Datasheet(PDF) 51 Page - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 51 Page - STMicroelectronics

Similar Part No. - ST72321BXXX-AUTO

Similar Description - ST72321BXXX-AUTO

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL