PT6520

V1.9

6

July 2010

FUNCTION DESCRIPTION

DISPLAY COMMANDS

(Based on the 80 port MPU; the RD and WR commands differ for the 68 port MPU)

Command

RD WR A0 D7 D6

D5

D4 D3

D2 D1 D0

Function

1

Display ON/OFF

1

0

0

1

0

1

0

1

1

1

0/1

Switches the entire display ON or OFF,

regardless of the Display RAM’s data or

the internal status. *

2

Display START Line

1

0

0

1

1

0

Display START Address

(0-31)

Determines the line of RAM data to be

displayed at the display’s top line

(COM0)

3

Page Address Set

1

0

0

1

0

1

1

1

0

Page

(0-3)

Sets the page of the Display RAM in the

page address register.

4

Column (segment)

Address Set

1

0

0

0

Column address(0-79)

Sets the column address of the Display

RAM in the column address register.

5

Status Read

0

1

0

00

0

0

Read the status.

Busy 1: Busy (internal processing)

0: Ready status

ADC 1: Rightward (forward) output

0: Leftward (reverse) output

ON/OFF 1: Display OFF

0: Display ON

RESET 1: Resetting. 0: Normal

6

Write Display Data

1

0

1 Write Data

Writes the data

on the data bus

to RAM

These commands

access a

previously-specified

address of the Display

RAM, after which the

column address is

incremented by one.

7

Read Display Data

0

1

1 Read Data

Reads data

from the

Display RAM

onto the data

bus.

8

ADC Select

1

0

0

1

0

1

0

0

0

0

0/1

Used to reverse the correspondence

between the Display RAM’s column

address and segment driver output

ports

0: Rightward (forward)output

1: Leftward (reverse) output

9

Static Drive ON/OFF

1

0

0

1

0

1

0

0

1

0

0/1

Selects normal display operation or

static all-lit drive display operation.

1: Static drive (power save)*

0: Normal display operation

10

Duty Select

1

0

0

1

0

1

0

1

0

0

0/1

Selects the duty factor for driving LCD

cells.

1: 1/32 duty,

0: 1/16 duty

11

Read Modify Write

1

0

0

1

1

1

0

0

0

0

0

Increments column address counter by

1 when display is written.

(This is not done when data is read)

12

End

1

0

0

1

1

1

0

1

1

1

0

Cancels the Ready Modify Write mode.

13

Reset

1

0

0

1

1

1

0

0

0

1

0

Resets the display START line to the 1st

line in the register.

Resets the column address counter to 0

and page address to 0.