ST10F271Z1 datasheet(62/185 Pages) STMICROELECTRONICS

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Parallel ports

ST10F271Z1

62/185

Parallel ports

13.1

Introduction

The ST10F271Z1 MCU provides up to 111 I/O lines with programmable features. These

capabilities bring very flexible adaptation of this MCU to wide range of applications.

ST10F271Z1 has nine groups of I/O lines gathered as follows:

●

Port 0 is a two time 8-bit port named P0L (Low as less significant byte) and P0H (high

as most significant byte)

●

Port 1 is a two time 8-bit port named P1L and P1H

●

Port 2 is a 16-bit port

●

Port 3 is a 15-bit port (P3.14 line is not implemented)

●

Port 4 is a 8-bit port

●

Port 5 is a 16-bit port input only

●

Port 6, Port 7 and Port 8 are 8-bit ports

These ports may be used as general purpose bidirectional input or output, software

controlled with dedicated registers.

For example, the output drivers of six of the ports (2, 3, 4, 6, 7, 8) can be configured (bit-

wise) for push-pull or open drain operation using ODPx registers.

The input threshold levels are programmable (TTL/CMOS) for all the ports. The logic level of

a pin is clocked into the input latch once per state time, regardless whether the port is

configured for input or output. The threshold is selected with PICON and XPICON registers

control bits.

A write operation to a port pin configured as an input causes the value to be written into the

port output latch, while a read operation returns the latched state of the pin itself. A read-

modify-write operation reads the value of the pin, modifies it, and writes it back to the output

latch.

Writing to a pin configured as an output (DPx.y=‘1’) causes the output latch and the pin to

have the written value, since the output buffer is enabled. Reading this pin returns the value

of the output latch. A read-modify-write operation reads the value of the output latch,

modifies it, and writes it back to the output latch, thus also modifying the level at the pin.

I/O lines support an alternate function which is detailed in the following description of each

port.

13.2

I/O’s special features

13.2.1

Open drain mode

Some of the I/O ports of ST10F271Z1 support the open drain capability. This programmable

feature may be used with an external pull-up resistor, in order to get an AND wired logical

function.

This feature is implemented for ports P2, P3, P4, P6, P7 and P8 (see respective sections),

and is controlled through the respective Open Drain Control Registers ODPx.

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