Motorola MPC564EVB Manuel d'utilisateur télécharger pdf (Page 29)

MPC564EVB User’s Manual 1-19

Connectors and User Components

1.5 Connectors and User Components

1.5.1 Keypad

The Keypad port provides MPC564 I/O connections for a passive 16 key 4x4 matrix keypad

(Axiom HC-KP). The port is applied as 4 column drivers and 4 row inputs. The MPC564

QADC_B Ports PQA[4:7] are column outputs and PQB[4:7] are row inputs. The row inputs have

10K ohm pull-down resistance applied to idle the row inputs low. A simple keypad scan will

enable each column output high one at a time and test the input rows for a high input. Column and

row position can then determine the value of the key pressed. Sample software for driving the

Keypad Port is provided on the MPC5xx support CD.

1.5.2 LCD Port

The LCD Port provides a versatile connector to attach 80 or 160 character display modules and

some graphics display modules with embedded controllers. Most LCD modules operate very

slowly compared to the MPC564 bus operation speeds so the LCD port provides a 16 bit wide

Read and Write capability for LCD module command and data bytes without the CPU waiting for

LCD access time. LCD Port access are performed as a 3 or 4 bus cycle transaction as follows:

This signal is needed only if control of EPEE or B0EPEE is

required by the Nexus tool.

This should be a 2.6-volt supply and not the ISRAMSTBY current

source.

The MPC533/4 has limited or no functionality for this module. See Appendix A

Table 1-8. Keypad

MPC564 I/O SIGNAL

1 QADC_B PQA4 out

2 QADC_B PQA5 out

3 QADC_B PQA6 out

4 QADC_B PQA7 out

5 QADC_B PQB4 in

6 QADC_B PQB5 in

7 QADC_B PQB6 in

8 QADC_B PQB7 in

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

nc...

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 97 98

Pas de commentaire

Motorola MPC564EVB Manuel d'utilisateur Page 29