ST7LITEUSX datasheet(7/108 Pages) STMICROELECTRONICS

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ST7LITEUSx

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PIN DESCRIPTION (Cont’d)

Legend / Abbreviations for Table 1:

Type: I = input, O = output, S = supply

In/Output level: CT= CMOS 0.3VDD/0.7VDD with

input trigger

Output level: HS = High sink (on N-buffer only)

Port and control configuration:

– Input:float = floating, wpu = weak pull-up, int = in-

terrupt, ana = analog

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

The RESET configuration of each pin is shown in

bold which is valid as long as the device is in reset

state.

Table 1. Device Pin Description

Note:

1. After a reset, the multiplexed PA3/RESET pin will act as RESET. To configure this pin as output (Port

A3), write 55h to MUXCR0 and AAh to MUXCR1. For further details, please refer to section 6.4 on page

24.

No.

Pin Name

Level

Port / Control

Main

Function

(after

reset)

Alternate Function

Input

Output

1VDD

Main power supply

PA5/AIN4/

CLKIN

I/O CT HS

ei4

Port A5

Analog input 4 or External Clock Input

PA4/AIN3

I/O CT HS

ei3

Port A4

Analog input 3

PA3/RESET 1)

Port A3

RESET 1)

PA2/AIN2/LTIC I/O CT HS

ei2

Port A2

Analog input 2 or Lite Timer Input Cap-

ture

PA1/AIN1/

ICCCLK

I/O CT HS

ei1

Port A1

Analog input 1 or In Circuit Communica-

tion Clock

Caution: During normal operation this

pin must be pulled-up, internally or ex-

ternally (external pull-up of 10k manda-

tory in noisy environment). This is to

avoid entering ICC mode unexpectedly

during a reset. In the application, even if

the pin is configured as output, any re-

set will put it back in pull-up

PA0/AIN0/ATP-

WM/ICCDATA

I/O CT HS

ei0

Port A0

Analog input 0 or Auto-Reload Timer

PWM or In Circuit Communication Data

8VSS

Ground

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