ST72321 datasheet(12/189 Pages) STMICROELECTRONICS

12 / 189 page

ST72321

12/189

Notes:

1. In the interrupt input column, “eiX” defines the associated external interrupt vector. If the weak pull-up

column (wpu) is merged with the interrupt column (int), then the I/O configuration is pull-up interrupt input,

else the configuration is floating interrupt input.

2. In the open drain output column, “T” defines a true open drain I/O (P-Buffer and protection diode to VDD

are not implemented). See See “I/O PORTS” on page 46. and Section 12.8 I/O PORT PIN CHARACTER-

ISTICS for more details.

3. OSC1 and OSC2 pins connect a crystal/ceramic resonator, or an external source to the on-chip oscil-

lator; see Section 1 INTRODUCTION and Section 12.5 CLOCK AND TIMING CHARACTERISTICS for

more details.

4. On the chip, each I/O port may have up to 8 pads. Pads that are not bonded to external pins are in input

pull-up configuration after reset. The configuration of these pads must be kept at reset state to avoid add-

ed current consumption.

PA6 (HS)/SDAI

I/O CT HS

TPort A6

I2C Data 1)

PA7 (HS)/SCLI

I/O CT HS

TPort A7

I2C Clock 1)

VPP/ ICCSEL

Must be tied low. In flash programming

mode, this pin acts as the programming

voltage input VPP. See Section 12.9.2

for more details. High voltage must not

be applied to ROM devices

RESET

I/O CT

Top priority non maskable interrupt.

EVD

External voltage detector

TLI

Top level interrupt input pin

VSS_2

Digital Ground Voltage

OSC23)

I/O

Resonator oscillator inverter output

OSC13)

External clock input or Resonator oscil-

lator inverter input

VDD_2

Digital Main Supply Voltage

PE0/TDO

I/O CT

Port E0

SCI Transmit Data Out

PE1/RDI

I/O CT

Port E1

SCI Receive Data In

PE2 (Flash device)

I/O CT

Port E2

Caution: In Flash devices this port is al-

ways input with weak pull-up.

PE2 (ROM device)

Port E2

Caution: In ROM devices, no weak

pull-up present on this port.

In TQFP44 this pin is not connected to

an internal pull-up like other unbonded

pins (See note 4). It is recommended to

configure it as output push pull to avoid

added current consumption.

PE3

I/O CT

Port E3

Pin n°

Pin Name

Level

Port

Main

function

(after

reset)

Alternate function

Input

Output

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