ST92141 datasheet(12/179 Pages) STMICROELECTRONICS

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ST92141 - GENERAL DESCRIPTION

Table 4. ST92141 Alternate functions

How to configure the I/O ports

To configure the I/O ports, use the information in

Table 3 and Table 4 and the Port Bit Configuration

Table in the I/O Ports Chapter on page 81.

I/O note = The hardware characteristics fixed for

each port line in Table 3.

All I/O inputs have Schmitt trigger fixed by hard-

ware so selecting CMOS or TTL input by software

has no effect, the input will always be Schmitt Trig-

ger. In particular, the Schmitt Triggers present on

the P5[7:2] pins have a standard hysteresis

whereas the remaining pins have Schmitt Triggers

with High Hysteresis (refer to Electrical Specifica-

tions).

Alternate Functions (AF) = More than one AF

cannot be assigned to an external pin at the same

time:

Port

Name

General

Purpose I/O

Pin No.

Alternate Functions

SDIP32 PSO34

P3.0

All ports useable

for general pur-

pose I/O (input,

output or bidi-

rectional)

MOSI

I/O SPI Master Output/Slave Input Data

P3.1

MISO

I/O SPI Master Input/Slave Output Data

P3.2

WKUP3

Wake-up line 3

STIN

Standard Timer Input

SCK

I/O SPI Serial Clock Input/Output

P3.3

SSN

SPI Slave Select

STOUT

Standard Timer Output

P3.4

EXTRG

A/D External trigger

OCPM2

Ext. Timer Output Compare 2

P3.5

INT6

External Interrupt 6

OCMP1

Ext. Timer - Output Compare 1

P3.6

ICAP1

Ext. Timer - Input Capture 1

WKUP2

Wake-up line 2

P5.0

ICAP2

Ext. Timer - Input Capture 2

WKUP1

Wake-up line 1

P5.1

NMI

Not maskable Int.

WKUP0

Wake-up line 0

P5.2

AIN2

Analog Data Input 2

INT0

External Interrupt 0

WDIN

Watchdog input

P5.3

AIN3

Analog Data Input 3

EXTCLK

Ext. Timer - Input Clock

WDOUT

Watchdog Output

P5.4

AIN4

Analog Data Input 4

P5.5

AIN5

Analog Data Input 5

P5.6

AIN6

Analog Data Input 6

CK_AF

Clock Alternative Source

P5.7

AIN7

Analog Data Input 7

INTCLK

Internal Main Clock

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