ST10F269ZX datasheet(67/184 Pages) STMICROELECTRONICS

67 / 184 page

ST10F269

12 - PARALLEL PORTS

67/184

Figure 23 : PORT1 I/O and Alternate Functions

When an external bus mode is enabled, the

direction of the port pin and the loading of data

into the port output latch are controlled by the bus

controller hardware.

The input of the port Buffer latch is disconnected

from the internal bus and is switched to the line

labeled “Alternate Data Output” via a multiplexer.

The alternate data is the 16-bit intra-segment

address. While an external bus mode is enabled,

the user software should not write to the port

output latch, otherwise unpredictable results may

occur. When the external bus modes are disabled,

the contents of the direction register last written by

the user becomes active.

The Figure 24 shows the structure of a PORT1

pin.

PORT1

P1H

P1L

Alternate Function

General Purpose Input/Output

8/16-bit Demultiplexed Bus

CAPCOM2 Capture Inputs only

P1H.7

P1H.6

P1H.5

P1H.4

P1H.3

P1H.2

P1H.1

P1H.0

P1L.7

P1L.6

P1L.5

P1L.4

P1L.3

P1L.2

P1L.1

P1L.0

A15

A14

A13

A12

A11

A10

CC27IO

CC26IO

CC25IO

CC24IO

Figure 24 : Block Diagram of a PORT1 Pin

Direction

Latch

Write DP1H.y / DP1L.y

Read DP1H.y / DP1L.y

Port Output

Latch

Write P1H.y / P1L.y

Read P1H.y / P1L.y

MUX

“1”

Input

Latch

Clock

P1H.y

P1L.y

Output

Buffer

y = 7...0

Alternate

Function

Enable

Port Data

Output

Alternate

Data

Output

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