Motorola MPC564EVB User Manual download pdf (Page 30)

1-20 MPC564EVB User’s Manual

Connectors and User Components

Access cycle 1: Write LCD control bits RS, R/W, LCD data byte. LCD1 and 2 select bits = 0.

Access cycle 2: Write LCD control bits LCD1 select, LCD2 select active as required. RS, R/W,

LCD data byte values do not change but must be written again.

Access cycle 3 = READ: Read LCD Port if a Read access type, determined by R/W = 1 in first

access cycles.

Access cycle 3 = WRITE: Write LCD control bits LCD1 select, LCD2 select idle. RS, R/W, LCD

data byte do not change but must be written again. This terminates a Write access sequence.

Access cycle 4 = READ end: Write LCD control bits LCD1 select, LCD2 select idle, RS, R/W bits

do not change but must be written again. This terminates a Read access sequence.

Table 1-9. LCD PORT REGISTER Definition (MPC500 core register aligned)

Example source code for the LCD and Keypad drivers are provided on the Axiom MPC5xx support

CD. The LCD Port is assigned on chip select CS3 if enabled with MAP Switch position 6. Memory

map offset for the LCD Port = CS3 base + 0x0010.

LCD Display CONTRAST

The CONTRAST adjustment allows a contrast Vee voltage to be presented to the LCD_PORT of

–5V to +5V DC.

JP2 - LCD_PORT Power Polarity Select

JP2 determines the display power pin polarity on the LCD_PORT. Depending on the type and

location of the IDC connector on your display module, the power connections may need to be

reversed. Care should be used to verify proper connection and signal matching at the IDC Cable

Connector and LCD_PORT.

See the schematic to match this jumper setting to your LCD device connector. Contact

[email protected] for assistance applying a LCD module.

BIT # FUNCTION

D0 LCD1 select, 80 character or first 80 characters of 160 character module select. 1 = Active

D1 LCD2 select, second 80 characters of 160 character module select. 1 = Active

D2 – D5 N/A, not applied

D6 LCD RS or Register Select. 0 = Command, 1 = Display Data access

D7 LCD Read / Write select. 0 = Write, 1 = Read access

D8 > D15 LCD Data Byte D7 > D0, Write output to LCD if D7 = 0, Read input if D7 = 1.

See LCD Module data sheet for command codes

Typical JP2 positions for 80 character or smaller LCD. Rotate 90 degrees for 160

character type modules.

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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Motorola MPC564EVB User Manual Page 30