MC145192EVK Ver la hoja de datos (PDF) - Motorola => Freescale

Número de pieza

componentes Descripción

Fabricante

MC145192EVK

MC145192 and MC145202 Evaluation Board Manual

Motorola => Freescale 

Up to three EVK boards can operate independently from one printer port. All lines on the printer port are

connected to every EVK. Even with three boards operating, only three output lines (Clock, Data and

Load) from the printer card are used. If two boards are controlled together, data for the second board is

received from the Output A of the first. Output A is a configurable output on ’192/202 devices, which in

this case is used to shift data through chip 1 into chip 2. Output A and Data are connected using a printer

port input line. This was done to avoid connecting extra wires. Fortunately not all port input lines are

needed for computer input. Load and Clock are common to both boards.

A three–board cascade is handled similarly to a two–board cascade. Out A on the first board is fed to

Data on the second. Out A on the second connects to Data on the third. Instructing the program on the

quantity of boards connected together allows it to modify the number of bits sent.

All boards have a DIP switch S1 which gives each a unique address. The configuration menu is used to

tell the program what type of board is connected at a board address. Switch positions for all possible

addresses are given in Figure 2.

Single Board Operation

Closed

1 234 5678

Open

Two– or Three–Board Cascade

Board A

Closed

1 234 5678

Open

Board B

Closed

1 23 4 5 6 78

Open

Board C

Closed

1 23 4 5 6 78

Open

Figure 2. Switch Positions

MC145192EVK • MC145202EVK

6

MOTOROLA

Share Link: