ST92F120JR9T datasheet(20/320 Pages) STMICROELECTRONICS

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ST92F120 - GENERAL DESCRIPTION

How to Configure the I/O ports

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

Table 3, Table 4 and the Port Bit Configuration Ta-

ble in the I/O Ports Chapter (See page 125).

Input Note = the hardware characteristics fixed for

each port line in Table 3.

– If Input note = TTL/CMOS, either TTL or CMOS

input level can be selected by software.

– If Input note = Schmitt trigger, selecting CMOS

or TTL input by software has no effect, the input

will always be Schmitt Trigger.

Alternate Functions (AF) = More than one AF

cannot be assigned to an I/O pin at the same time:

An alternate function can be selected as follows.

AF Inputs:

– AF is selected implicitly by enabling the corre-

sponding peripheral. Exception to this are A/D in-

puts which must be explicitly selected as AF by

software.

AF Outputs or Bidirectional Lines:

– In the case of Outputs or I/Os, AF is selected ex-

plicitly by software.

Example 1: SCI input

AF: SIN0, Port: P5.2, Input note: Schmitt Trigger.

Write the port configuration bits:

P5C2.2=1

P5C1.2=0

P5C0.2 =1

Enable the SCI peripheral by software as de-

scribed in the SCI chapter.

Example 2: SCI output

AF: SOUT0, Port: P5.3, Output note:

Push-Pull/OD.

Write the port configuration bits (for AF OUT PP):

P5C2.3=0

P5C1.3=1

P5C0.3 =1

Example 3: External Memory I/O

AF: A0/D0, Port : P0.0, Input Note: TTL/CMOS

Write the port configuration bits:

P0C2.0=1

P0C1.0=1

P0C0.0 =1

Example 4: Analog input

AF: A0IN0, Port : 7.0, Input Note: does not apply

to analog input

Write the port configuration bits:

P7C2.0=1

P7C1.0=1

P7C0.0 =1

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