ST72521R datasheet(7/11 Pages) STMICROELECTRONICS

7 / 11 page

ST72521M/R/AR

7/11

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

PC7/SS/AIN15

I/O CT

Port C7

SPI Slave

Select (active

low)

ADC Analog

Input 15

PA0

I/O CT

ei0

Port A0

PA1

I/O CT

ei0

Port A1

PA2

I/O CT

ei0

Port A2

PA3 (HS)

I/O CT HS

ei0

Port A3

VDD_1

Digital Main Supply Voltage

VSS_1

Digital Ground Voltage

PA4 (HS)

I/O CT HS

Port A4

PA5 (HS)

I/O CT HS

Port A5

PA6 (HS)/SDAI

I/O CT HS

Port A6

I2C Data 1)

PA7 (HS)/SCLI

I/O CT HS

Port A7

I2C Clock 1)

VPP/ ICCSEL

Must be tied low. In flash programming

mode, this pin acts as the programming

voltage input VPP. 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

PH4

I/O TT

Port H4

PH5

I/O TT

Port H5

PH6

I/O TT

Port H6

PH7

I/O TT

Port H7

VSS_2

Digital Ground Voltage

OSC23)

I/O

Resonator oscillator inverter output or

capacitor input for RC oscillator

OSC13)

External clock input or Resonator oscil-

lator inverter input or resistor input for

RC oscillator

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/CANTX

I/O CT

Port E2

CAN Transmit Data Output

PE3/CANRX

I/O CT

Port E3

CAN Receive Data Input

Pin n

Pin Name

Level

Port

Main

function

(after

reset)

Alternate function

Input

Outpu t

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