ST10F269Z1Q6 datasheet(57/184 Pages) STMICROELECTRONICS

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ST10F269

12 - PARALLEL PORTS

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12 - PARALLEL PORTS

12.1 - Introduction

The ST10F269 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.

ST10F269 has 9 groups of I/O lines gathered as

following:

– Port 0 is a 2 time 8-bit port named P0L (Low as

less significant Byte) and P0H (high as most sig-

nificant Byte)

– Port 1 is a 2 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 imple-

mented)

– 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 port

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.

In addition, the sink and the source capability and

the rise / fall time of the transition of the signal of

some of the push-pull buffers can be programmed

to fit the driving requirements of the application

and to minimize EMI. This feature is implemented

on Port 0, 1, 2, 3, 4, 6, 7 and 8 with the control

registers POCONx. The output drivers capabilities

of ALE, RD, WR control lines are programmable

with the dedicated bits of POCON20 control

The input threshold levels are programmable

(TTL/CMOS) for 5 ports (2, 3, 4, 7, 8). 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 the PICON register 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

configured

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.

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