ST7261 datasheet(6/80 Pages) STMICROELECTRONICS

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ST7261

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PIN DESCRIPTION (Cont’d)

Legend / Abbreviations:

Type:

I = input, O = output, S = supply

Input level:

A = Dedicated analog input

Input level:

C = CMOS 0.3VDD/0.7VDD,

CT= CMOS 0.3VDD/0.7VDD with input trigger

Output level:

HS = high sink (on N-buffer only)

Port configuration capabilities:

– Input:

float = floating, wpu = weak pull-up, int = interrupt (\ =falling edge, / =rising edge),

ana = analog

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

Table 1. Device Pin Description

Pin n°

Pin Name

Level

Port / Control

Main

Function

(after reset)

Alternate Function

Input

Output

914 VPP

FLASH programming voltage (12V), must be

tied low in user mode.

11 16 OSCIN

These pins are used connect an external

clock source to the on-chip main oscillator.

12 17 OSCOUT

VSS

Digital Ground Voltage

813 VDD

Digital Main Power Supply Voltage

13 18 PB7/IT8

I/O CT HS

Port B7

Interrupt 8 input

14 19 PB6/IT7

I/O CT HS

Port B6

Interrupt 7 input

15 20 PB5/IT6

I/O CT HS

Port B5

Interrupt 6 input

PB4/IT5

I/O CT HS x

Port B4

Interrupt 5 input

PB3

I/O CT HS

Port B3

PB2

I/O CT HS

Port B2

PB1

I/O CT HS

Port B1

PB0/MCO

I/O CT HS

Port B0

CPU clock output

PA2/IT3

I/O CT

Port A2

Interrupt 3 input

PA1/IT2

I/O CT

Port A1

Interrupt 2 input

PA0/IT1/USBOE

I/O CT

Port A0

Interrupt 1 input/USB Output

Enable

10 15 RESET

I/O

Top priority non maskable interrupt (active

low)

10 USBDM

I/O

USB bidirectional data (data -)

11 USBDP

I/O

USB bidirectional data (data +)

12 USBVCC

USB power supply 3.3V output

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