ST92163 datasheet(18/224 Pages) STMICROELECTRONICS

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ST92163 - GENERAL DESCRIPTION

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 100.

I/O Note = the hardware characteristics fixed for

each port line.

Inputs:

– If I/O note = TTL/CMOS, either TTL or CMOS in-

put level can be selected by software.

– If I/O note = Schmitt trigger, selecting CMOS or

TTL input by software has no effect, the input will

always be Schmitt Trigger.

Outputs:

– If I/O note = Push-Pull, either Push Pull or Open

Drain can be selected by software.

– If I/O note = Open Drain, selecting Push-Pull by

software has no effect, the input will always be

Open Drain.

Alternate Functions (AF) = More than one AF

cannot be assigned to an external pin at the same

time: it can be selected as follows, but simultane-

ous availability of several functions of one pin is

obviously impossible.

AF Inputs:

– AF is selected implicitly by enabling the corre-

sponding peripheral. Exceptions to this are ADC

inputs which are selected explicitly as AF by soft-

ware.

AF Outputs or Bidirectional Lines:

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

explicitly by software.

Example 1: Timer/Watchdog input

AF: WDIN, Port: P5.5, I/O note: Input Schmitt Trig-

ger.

Write the port configuration bits:

P5C2.5=1

P5C1.5=0

P5C0.5=1

Enable the WDT peripheral by software as de-

scribed in the WDT chapter.

Example 2: Timer/Watchdog output

AF: WDOUT, Port: P5.7, I/O note: None

Write the port configuration bits:

P5C2.7=0

P5C1.7=1

P5C0.7=1

Example 3: ADC input

AF: AIN0, Port: P6.2, I/O note: Does not apply to

ADC

Write the port configuration bits:

P6C2.2=1

P6C1.2=1

P6C0.2=1

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