ST72321BXXX-AUTO datasheet(77/247 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

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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77 / 247 page

ST72321Bxxx-Auto

I/O ports

77/247

Figure 29.

I/O port general block diagram

Table 28.

I/O port mode options

Configuration mode

Pull-up

P-buffer

Diodes

to VDD

to VSS

Input

Floating with/without Interrupt

Off

On

Pull-up with/without Interrupt

On

Output

Push-pull

Off

On

Open-drain (logic level)

Off

True open-drain

NI

NI(1)

1.

The diode to VDD is not implemented in the true open-drain pads. A local protection between the pad and

VSS is implemented to protect the device against positive stress.

Legend:

Off - Implemented not activated

On - Implemented and activated

NI

- Not implemented

DR

DDR

OR

PAD

VDD

ALTERNATE

ENABLE

ALTERNATE

OUTPUT

1

0

OR SEL

DDR SEL

DR SEL

PULL-UP

CONDITION

P-BUFFER

(see table below)

N-BUFFER

PULL-UP

(see table below)

1

0

ANALOG

INPUT

If implemented

ALTERNATE

INPUT

VDD

DIODES

(see table below)

EXTERNAL

SOURCE (eix)

INTERRUPT

CMOS

SCHMITT

TRIGGER

REGISTER

ACCESS

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ST72321BXXX-AUTO Datasheet(PDF) 77 Page - STMicroelectronics

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