Motorola CML12S-DP256 User's Guide download pdf (Page 19)

CML12SDP256 10/10/02

CAN BUS TERMINATION

The CAN port provides RC11,12, and 13 1206 SMT size termination resistors on the bottom of

the CML12Sxxx board that are not installed at the factory. The termination resistors provide

optional bias and termination impedance for the CAN bus connected to the CAN Port. Type of

wire media, data rate, length of wire, and number of CAN bus nodes can all effect the

requirement or value of the termination for the CAN bus. User should refer to particular

application for termination requirements.

RC11 CAN-H Bias Resistor: Provides bias to ground potential.

RC12 CAN-L Bias Resistor: Provides bias to +5V potential.

RC13 CAN Termination Resistor: Provides end point termination between CAN-H and CAN-

L signal.

P1 - P4 HCS12 Header Ring

P1 - P4 provide a header ring for all I/O of the HCS12 device. These connectors are not

installed. User should refer to the CML12S board schematic diagram for connector pin

connections. All HCS12 I/O is available from the other I/O Ports on the board.

LCD_PORT

The LCD_PORT interface is connected to the HCS12 SPI-0 port and applies a serial shift

timing characteristics of the HCS12 data bus and the slow timing of the standard LCD

Modules. Example LCD Port assembly language driver software is provided on the support CD

to demonstrate typical LCD module operation using this technique.

The interface supports all OPTREX DMC series and similar displays with up to 80 characters

in 4 bit bus mode and provides the most common pinout for a dual row rear mounted display

connector. The LCD module VEE or contrast potential is 0 Volts on this board. The LCD

module type should be TN (Standard Twist) style and Reflective to support this VEE potential.

The Axiom Mfg. HC-LCD is also compatible. The LCD Module is configured in a Write only

mode, it is not possible to read current cursor position or the busy status back from the

module.

LCD_PORT Connector

+5V 2 1GND

RS 4 3 VEE-GND

EN 6 5R/W-GND

DB1 8 7DB0

DB3 10 9DB2

DB5 12 11 DB4

DB7 14 13 DB6

SPI data bit definitions to LCD Port:

D0 - D3 = DB4 - 7, LCD data

D4 - D5 = Spare pins S1 and S2, not connected

D6 = RS, 0 = LCD Command, 1 = LCD Data

D7 = EN, 1 = LCD enable.

DB0 -DB3 are not applied and have 10K pull-down

resistance.

NOTES:

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Motorola CML12S-DP256 User's Guide Page 19

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