ST72C171 datasheet(6/152 Pages) STMICROELECTRONICS

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ST72C171

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PIN DESCRIPTION (Cont’d)

Legend / Abbreviations:

Type:

I = input, O = output, S = supply

In/Output level: C = CMOS 0.3VDD/0.7VDD,

CR = CMOS Levels with resistive output (1K)

A = Analog levels

Output level:

HS = high sink (on N-buffer only),

Port configuration capabilities:

– Input:float = floating, wpu = weak pull-up, int = interrupt, ana = analog

– Output: OD = open drain, T = true open drain, PP = push-pull

Note: the Reset configuration of each pin is shown in bold.

Table 1. Device Pin Description

n°

Pin Name

Level

Port

Main

function

(after

reset)

Alternate function

Input

Output

OA2OUT

OA2 output

PC1/OA2PIN/

PWM1R

I/O

C/CR X

Port C1

OA2 noninverting input and/or

ART PWM1 resistive output

PC0/OA2NIN

I/O C/A

Port C0

OA2 inverting input

OA3PIN

OA3 noninverting input

PB7/TDO

I/O

ei1

Port B7

SCI transmit

PB6/RDI

I/O

ei1

Port B6

SCI receive

PB5/MISO/ISPDATA I/O

ei1

Port B5

SPI data master in/slave out or

In Situ Programming Data In-

put

PB4/MOSI

I/O

ei1

Port B4

SPI data master out/slave in

PB3/SCK/ISPCLK

I/O

ei1

Port B3

SPI Clock or In Situ Program-

ming Clock Output

910PB2/SS

I/O

ei1

Port B2

SPI Slave Select (active low)

10 11 PB1/ARTCLK

I/O

ei1

Port B1

ART External Clock

11 12 PB0/EXTCLK

I/O

ei1

Port B0

Timer16 External Clock

12 13 VDD

Digital Main Supply Voltage

13 14 VSS

Digital ground voltage

14 15 OSC2

Resonator oscillator inverter output or capaci-

tor input for RC oscillator

15 16 OSC1

External clock input or Resonator oscillator in-

verter input or resistor input for RC oscillator

16 17 ISPSEL

In Situ Programming Mode Select

Must be tied to VSS in user mode

17 18 RESET

I/O

External Reset

18 19 PA0/AIN0

I/O

ei0

Port A0

ADC input 0

19 20 PA1/AIN1/ICAP2

I/O

ei0

Port A1

ADC input 1 orTimer16 input

capture 2

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