Datasheet GU280x16G-7806A Datasheet (Noritake)

280x16 Dot Graphic (2x40 characters)

The module includes the Vacuum Fluorescent Display glass, VF drivers

C

N1 - PARALLEL INTERFACE

CN2 – SERIAL

INTERFACE

ELECTRICAL SPECIFICATION

SOFTWARE COMMAND SUMMARY

46H =

43H = Clear Area

4FH = Set Outline Box

6FH = Clear Outline Box

FFH

OPTICAL and ENVIRONMENTAL SPECIFICATIONS

18.47

137.0

175.0

182.0 3.5

11.0

26.5

33.5

3.5

165.0 8.6 max

5.0 max

1.6

Pin 1

CN2

CN4 Pin 1

Parallel Interface type (M68 / i80)

SERIAL MODE

International Font

5x7 & 10x14 Font LCD Font

Dot Graphic VFD Module GU280x16G-7806A

q
q Single 5V Supply
q High Brightness Blue Green Display
q Operating Temp -40°C to +85°C
q 3 Multi Sized Fonts
q 4/8 Bit Parallel LCD & Serial Interfaces

CN1

Pin
1

and micro-controller ICs with refresh RAM, character generator and
interface logic. The 4/8 bit parallel & serial bi-directional interfaces are
5V TTL/CMOS compatible. The command set is LCD compatible with
extended graphic functions.

Pin Async SPI

1 5V 5V
2 NC SCK
3 RXD /SS
4 LINK1 SIN
5 0V 0V
6 LINK2 SOUT
7 TXD NC
8 /RES /RES
9 MB MB

10 HB HB

NC = Do Not Connect

Pin Sig Pin Sig

1 GND 2 VCC
3 NC* 4 RS
5 R/W 6 E
7 D0 8 D1
9 D2 10 D3

11 D4 12 D5

Dimensions in mm & subject to tolerances.

Mounting holes 3.5mm dia.

Parameter Symbol Value Condition

Power Supply Voltage VCC 5.0VDC +/- 5% GND=0V
Power Supply Current ICC 400mADC typ. VCC=5V
Logic High Input VIH 0.8VDC min. Vcc max. VCC=5V
Logic Low Input VIL 0VDC min. 0.2VDC max. VCC=5V
Logic High Output VOH 3.8VDC min. Vcc max. IOH = 1.5mA
Logic Low Output VOL 0VDC min. 0.6VDC max. IOL =1.6mA

Parameter Value
Display Area (XxY mm) 137.05 x 11..00
Dot Size/Pitch (XxY mm) 0.34 x 0.5 / 0.49 x 0.7
Luminance 500 cd/m2 Typ.
Colour of Illumination Blue-Green (Filter for colours)
Operating Temperature
Storage Temperature
Operating Humidity (non condensing)

-40°C to +85°C

-40°C to +85°C
20 to 80% RH @ 25°C

Instruction R/W RS D0-D7

Clear Display L L 01H
Cursor Return Home L L 02H
Entry Mode Set L L 04H-07H
Display ON/OFF L L 08H-0FH
Cursor Shift Left L L 10H
Cursor Shift Right L L 14H
Display Shift Left L L 18H
Display Shift Right L L 1CH
Select 4/8 bit interface L L 20H (4Bit) / 30H (8Bit) + luminance
Display Luminance L H 00H-03H (must follow above command)
Set CG RAM Addr. L L 40H-7FH
Set DD RAM Addr. L L 80H-E7H
Read BUSY/Addr. H L 00H-FFH D7 Busy = High
Read Data from RAM H H 00H-FFH
Set Graphic Cursor L L F0H + xpos + ypos
Set Area Commands

L L
L H
L H
L H
L H

F1H + x1 + y1 + x2 + y2 + cmd
where cmd 49H = Invert Area

Fill Area

L H
Write Graphic Image L L F1H + x1 + y1 + x2 + y2 + cmd + data
Set Font / Spacing L L F2H + font style
Set RS Low 0FH Serial Comms. only
Read Data FEH Serial Comms. only
Read Cursor Position

Serial Comms. only

CHARACTER SET

UDF1

UDF2

UDF3

UDF4

UDF5

UDF6

UDF7

UDF8

UDF1

UDF2

UDF3

UDF4

UDF5

UDF6

UDF7

UDF8

NOTE: UDF characters are available using 5x7 font only.

Proportional Mini Font

Serial / Parallel Selection

J5 Interface

Open Sync Serial / Parallel (default)

Link Asynchronous Serial

J3 J6 Mode

Signals

1-2 1-2 i80 Pin 5 = /WR, Pin 6 = /RD
2-3 2-3 M68 Pin 5 = R/W, Pin 6 = E

J7

Configuration

1 2 8

O O O 9600, N, 8, 1

L O O 19200, N, 8, 1
O L O 38400, N, 8, 1
X X L Self Test Mode

Copyright 2007 Noritake Itron Corp. Japan

13 D6 14 D7

Pin 3 can be changed to /RESET or
BUSY terminal and selectable by jumper
J2 (2-3) or J2 (1-2)

CN1 Pin 3 Function

J2 Font

2 & 3 / Reset

1 & 2 Busy
All J7 links & J5 should be open for
Parallel operation.

CONTACT

Noritake Sales Office Tel Nos

Nagoya Japan: [phone]

Canada: [phone]

Chicago USA: [phone]

Munchen (D): [phone]

Itron UK: [phone]

Rest Europe: [phone]

www.noritake-itron.com

Subject to change without notice.

IUK Doc Ref: 10405 Iss:5 09Oct07

NORITAKE ITRON VFD MODULES GU280x16G-7806A

Note:

will re

Dot Graphic VFD Module GU280x16G-7806A

SOFTWARE COMMANDS

Instruction Data Format (RS = 1) Description

UDF Write 00H – 0FH Write user defined character 1-8 to the current cursor location on the display.
Data Write

(40us – LCD compatible mode)
(250us – Graphic mode)

Data Read

(40us – LCD compatible mode)

00H – FFH Write data to the display. In normal (LCD compatible) mode of operation, data is written to the display data (DD

00H – FFH Read data from the display. In normal (LCD compatible) mode of operation, data is read from the display data

RAM) or character generator (CG RAM).
When using the graphical data commands (F0H, F1H & F2H), data is written direct to the display and is not
stored in DD RAM. Data write busy times will increase when using the graphic functions.

(DD RAM) or character generator (CG RAM).

Instruction Data Format (RS = 0) Description

Status / Cursor Position
Read

(40us – LCD compatible mode)

Display Clear

(150µs)

Cursor Home

(500µs)

Entry Mode

(40µs)

Display Control

(50us)

Cursor Shift Left

(40us)

Cursor Shift Right

(40us)

Display Shift Left

(150us)

Display Shift Right

(150us)

Select 4 bit interface

(40µs)

Select 8 bit interface

(40µs)

Set CG Address

(40us)

Set DD Address

(40us)

Set Graphic Cursor

(40us)

*Note

Set Area

(40us + 500us[cmd byte])

Write Graphic Image

(40us + 500us[cmd byte])

Set Font

(40us)

*Note

Port Configure F4H + byte Bit 7 High = I/O Port, Low = Serial Port. See extended port and serial commands.
Read Port Status F5H The current port status is read with RS high. See extended port and serial commands.
Port Out / Serial Send F6H + byte byte is output from the port. In serial mode check the busy status before sending again.
Port In / Serial Read F7H The current port levels or buffered received data can be read with RS high.
Port Buffer Send F8H + size + data Up to 128 bytes of data can be buffered before being transmitted from the serial port.

00H - FFH D0 – D6 of read data corresponds to the current cursor position. D7 shows the status of busy.

01H Fills all locations in the display data (DD) RAM with 20H (blank character). The address counter is set to 0 in the

DD RAM. The address counter is set to increment on each data read/write. Any display offset (using the display
shift command) is removed.

02H The address counter is set to 0 in the DD RAM. Any display offset (using the display shift command) is removed.
04H – 07H Bit 1 is used to select the direction of the address counter on each data read or write. If set to ‘1’, the address

08H-0FH Bit 2 is used to enable or disable the display. If this bit is set to ‘0’ the VFD’s power supply is turned off to reduce

counter is incremented. If set to ‘0’, the address counter is decremented.
Bit 0 enables the display to shift on each data read/write. If this bit is set to ‘1’, the display is shifted with the
cursor. The display shift direction depends upon the address counter direction (bit1). If this is set to increment,
the display is shifted left, if the address counter is set to decrement, the display is shifted right.
Note: When display shift is enabled, the data write busy time can increase by 300us.

power consumption.
Bit 0 enables the flashing block cursor.
Note: If the cursor is enabled, busy times can increase by 20us.

10H Shift the cursor position (address counter) one position to the left.
14H Shift the cursor position (address counter) one position to the right.
18H Shift the display left, one character position.
1CH Shift the display right, one character position.
20H + lum (RS=1) Enables 4-bit communications. Data is received on DB4-DB7 only. Two writes are required to send one data

30H + lum (RS=1) Enables 8-bit communications. Data is received on DB0-DB7. The lum value sets the displays brightness, and
40H – 7FH Set the character generator address (CG RAM). All written data is placed within the user definable character

byte. The most significant nibble should be sent first. Refer to the ‘Parallel Communications’ section for more
information. The lum value sets the displays brightness, and must be sent with the RS line high: ­00H = full brightness, 01H = 75%, 02H = 50% & 03H = 25%.

must be sent with the RS line high: - 00H = full brightness, 01H = 75%, 02H = 50% & 03H = 25%.
area.

80H – E7H Set the display data address (DD RAM). 80H – A7H = top line. C0H – E7H = bottom line.

*Note

F0H + xpos + ypos Set the absolute cursor position. xpos = 0 – 279, ypos = 0 – 15.

F1H + x1 + y1 + x2 + y2 +
cmd

*Note

F1H + x1 + y1 + x2 + y2 +
cmd

2-bytes are required to send the horizontal position xpos. The upper byte precedes the lower byte.
Co-ordinates should be written with RS line set high.
Area Commands: - ‘I’ - invert area, ‘F’ – fill area, ‘C’ = clear area, ‘O’ – set outline, ‘o’ – clear outline.

All area commands should be preceded with the area co-ordinates. X1 Y1 left top X2 Y2 bottom right.
Co-ordinates and command should be written with RS line set high.
2-bytes are required to send the horizontal positions X1 & X2. The upper byte precedes the lower byte.
Image Commands: - ‘H’ – write horizontal graphical data with horizontal cursor movement.
‘V’ – write vertical graphical data with horizontal cursor movement.
‘h’ – write horizontal graphical data with vertical cursor movement.
‘v’ – write vertical graphical data with vertical cursor movement.
Graphical data should immediately follow the ‘H’,’h’,’V’ and ‘v’ commands.
Co-ordinates, command and graphical data should be written with RS line set high.
2-bytes are required to send the horizontal positions X1 & X2. The upper byte precedes the lower byte.

F2H + font Select font type, font size and font spacing.

Font commands: - ‘A’ or ‘a’ = proportional 64 character mini-font.
‘B’ = 5x7 LCD compatible font with Katakana characters.
‘C’ = 10x14 LCD compatible font with Katakana characters.
‘b’ = 5x7 international font with European characters.
‘c’ = 10x14 international font with European characters.
‘1’ = set the inter-character pixel spacing to 1 pixel.
‘2’ = set the inter-character pixel spacing to 2 pixels.
Font command should be written with RS line set high.

Instruction Data Format Additional Serial Data Commands

Set RS Low 0FH Set the RS line low for the following byte only. Used in serial communications only.
Read Data FEH Read data at current cursor position. This command is used with serial communications only.
Read Cursor Position FFH Read current cursor position. This command is used with serial communications only.

After these commands are executed, the cursor will be disabled and any character data will be written to the display only, and not the DD RAM. Any subsequent LCD compatible command

-enable the cursor and allow for DD RAM writing.

NORITAKE ITRON VFD MODULES GU280x16G-7806A

X1, Y1

DATA

DATA

X1, Y1

DATA

X1, Y1

MSB DATA

UPPER NIBBLE

LOWER NIBBLE

from CN1 pin 3 if link J2

is set to 2&3.

Dot Graphic VFD Module GU280x16G-7806A

GRAPHICAL DATA WRITES

X1, Y1

DIRECTION

MSB

MSB

DIRECTION

DIRECTION

DIRECTION

MSB

Vertical Data & Horizontal

Movement

Vertical Data & Vertical

Movement

PARALLEL COMMUNICATIONS

This module has a fast latching 8-bit data bus. The ‘RS’ and ‘R/W’
control lines should be set prior to the rising edge of the ‘E’ enable line.
Data is clocked in on the falling edge of the enable line. The busy line
should be checked before sending data.

HOST
SYSTEM

I/O

I/O
I/O
I/O
I/O

D0-7

E
RS
R/W
BUSY

The busy state can be monitored on D7 when reading the DDRAM
address (RS line low). The busy state can also be monitored directly

GU280x16G-7806A

VDD GND VDD GND

Horizontal Data & Horizontal

Movement

8-Bit Data Write Timing Diagram.

R/W

RS

>30ns

E

D0-D7

BUSY

>25ns

8-Bit Data Read Timing Diagram.

R/W

>30ns

RS

>200ns

E

<65ns >50ns

D0-D7

>20ns

VALID

Horizontal Data & Vertical

Movement

>30ns

<25ns

tBUSY

HOST
SYSTEM

I/O

I/O
I/O
I/O
I/O

D4-7

E
RS
R/W
BUSY

GU280x16G-7806A

VDD GND VDD GND

The data bus width can be selected for 4-bit operation, using data lines
D4-D7. Within this mode, two writes are required to send one data byte.
The high nibble (bits 4-7) should be sent first, followed by the low nibble
(bits 0-3). The busy state is not triggered between nibbles. It is
important that the status is NOT read within 40us of sending the
command to set either 4 or 8 bit mode.

4-Bit Data/Command Write Timing Diagram.

R/W

RS

>30ns

E

D4-D7

BUSY

>25ns

>20ns

>100ns

>100ns

>25ns

>20ns

<120ns

>100ns

tBUSY

NORITAKE ITRON VFD MODULES GU280x16G-7806A

MSB

LSB

>250ns >250ns

D0 D1 D2 D3 D4 D5 D6 D7 START

STOP

RXD MB

<20us tBUSY

D0 D1 D2 D3 D4 D5 D6 D7 START

STOP

TXD

HB

DISPLAY TEXT

SET CURSOR

LOWER NIBBLE

UPPER NIBBLE

Dot Graphic VFD Module GU280x16G-7806A

4-Bit Data/Status Read Timing Diagram.

R/W

RS

>30ns >250ns

E

>250ns

D4-D7

<250ns

>50ns

100ns

>250ns

Valid Valid

>50ns

ASYNCHRONOUS SERIAL COMMUNICATION

Asynchronous & synchronous serial interfaces are provided at TTL level. Synchronous is enabled with parallel, first received byte disables the
other. To enable Asynchronous Serial Mode connect pin 4 and 6 on CN2 (LINK1 and LINK2), Link J5 and enable i80 Mode on J3 and J6. When
using Asynchronous serial communications, the module is automatically initialized at power-up/reset with the cursor enabled.

HOST
SYSTEM

TXD
RXD
DTR
CTS

VDD GND

RXD
TXD
HB
MB

GU280x16G-7806A

VDD GND

Host to Module Write

Module to Host Write

The host busy line (HB) stops the module from sending data

<200us

to the host. The use of the HB and MB lines are optional, and
can be connected together if not required.

SYNCHRONOUS SERIAL COMMUNICATION

With synchronous communications enabled, data can be clocked into the VFD module on the rising edge of SCK, with the MSB sent first. The host
must provide adequate delays for the module to process the data, these busy times are specified in the software command section. Alternatively
the host can monitor the MB (Module Busy) line.

HOST
SYSTEM

I/O
I/O
I/O
I/O
I/O

SIN
SOUT
SCK

/SS
MB

GU280x16G-7806A

VDD GND VDD GND

The /SS pin can be used as an enable pin if other devices are
connected to the serial line, and also allows byte synchronisation.
The use of the /SS line is recommended, but can be permanently
pulled low if not required.

>125ns

SCK

MOSI

MISO

MB

/SS

TTL Synchronous serial communication.

>250ns

>250ns

MSB LSB

<20us tBUSY

SERIAL CONTROL

An additional command has been included to distinguish between command and data writes when using serial communications. This command
(0FH) will temporarily set the RS line low for the subsequent written byte. The following example displays two text messages using the serial
communications and the ‘Set RS’ command: -

CLEAR DISPLAY

0FH 01H 0FH 80H ‘NORITAKE ITRON’
0FH C0H ‘VFD MODULES’

Displaying text using serial communications.

NORITAKE ITRON VFD MODULES GU280x16G-7806A

Dot Graphic VFD Module GU280x16G-7806A

LCD COMPATIBILITY

This module features a command set that is LCD compatible, allowing easy replacement in existing equipment with little or no modifications.
Careful consideration should be taken regarding the command execution times of this module. Although the commands can be executed within
40us, which is normal for LCD, busy times are increased when using the scroll write modes and with the cursor enabled. When using the 4-bit
parallel mode, a 40us delay is required between nibbles. Also reading back data in 4-bit parallel mode is not supported. DD RAM address
locations 70H+ are used to access the extended graphic commands.

At power up and reset the module is automatically initialised and ready to receive data. The interface is set to 8-bit, the display is cleared, the
cursor position is set to the top-left corner (DD RAM address = 00H), and the display luminance is set to 100%.

RESET

At power ON the modules internal reset requires at least 8mS before commands can be sent. Please check the busy status. If you connect pin 3 to
the hardware reset using jumper 3, the module will require 3mS to re-ilitialize. Reset is achieved by high-low-high transition of at least 100nS.

EXTENDED GRAPHIC COMMANDS Command Structure and Values Copyright 2007 Noritake Co Limited, Japan

In addition to the standard LCD commands, this module includes additional commands to display graphical data, different font sizes, fill, clear
and invert defined areas of the display. Also an outline command is available to draw rectangles around objects. When any of these extended
commands are executed, the module will change to the ‘graphics’ mode of operation. This graphics mode allows text to be written to any part of
the display.

There are many differences the user should be aware of when the display is in this graphics mode: -

The graphics mode is disabled as soon as any valid LCD command is received.

Written data may require additional busy times.
Text data is not written into the DD RAM and therefore can not be read back.
Graphical text can not be shifted onto the display.
The cursor is disabled & cursor direction is set to increment only.
UDF characters cannot be written.

DISPLAYING GRAPHICAL TEXT

The module contains 3 font sizes, a proportional mini-font, 5x7 pixel, and a 10x14 pixel
font. Graphical text can be written to any part of the display using the ‘Set Graphic Cursor’
command (F0H). Characters are positioned above the current cursor position. Each
character written will include either a one pixel or two pixel space to the right side of the
character. After each character is written to the display, the cursor position is automatically
advanced. If the cursor position reaches the end of the display, the host must reposition to
the next line.

0,0

0,7

The following example displays two text messages in the center of the display using the
standard 5x7 character font. Command bytes that are underlined should be sent with RS
line low.

5x7 FONT

F2H ‘B’ F0H 00H 8BH 07H ‘NORITAKE ITRON’
F0H 00H 65H 0FH ‘VFD MODULES’

The next example displays one line of text using the 10x14 character font. Command bytes
that are underlined should be sent with RS line low.

10x14 FONT DISPLAY TEXT SET CURSOR

F2H ‘C’ F0H 00H 68H 0FH ‘280x16’

DISPLAY TEXT SET CURSOR

Cursor Positioning, example of writing 2 characters

Displaying text using the 5x7 font.

Displaying text in the large 10x14 font.

6,7

from cursor position 0,7.

NORITAKE ITRON VFD MODULES GU280x16G-7806A

multiple

B1H 89H 42H 3CH 00H

BYTE1

BYTE21

BYTE2 BYTE20 BYTE40

-

48H

-

1DH

-

36H

TOP LEFT

SET AREA

BOTTOM RIGHT

SET AREA

FILL

OUTLINE

VERTICAL LINE

SET AREA

FILL

TOP LEFT

SET AREA

BOTTOM RIGHT

INVERT HORIZONTAL LINE

Dot Graphic VFD Module GU280x16G-7806A

DISPLAYING GRAPHICS

Graphical images can be displayed on the VFD module in either a horizontal or vertical byte orientation. After each graphical data write, the cursor
is automatically advanced. All graphical data is contained within the defined area. Unused bits are masked where the screen area is not a byte

The following example displays a simple graphical image. The graphical data orientation is
set to horizontal data format, with a vertical cursor movement. Command bytes that are
underlined should be sent with RS line low.

AREA COMMAND

F1H 00H 60H 04H 00H 67H 0BH ‘h’ 1CH 5CH 48H 3EH 1DH 1DH 14H 36H

AREA CO-ORDINATES HORIZONTAL FORMAT

GRAPHIC DATA

MSB

MSB

Graphic Image using horizontal data

- 1CH

- 5CH

- 3EH

- 1DH

- 14H

BYTE19

The next example displays a simple graphical image using a vertical data format, with a
horizontal cursor movement. Command bytes that are underlined should be sent with RS
line low.

GRAPHIC DATA AREA COMMAND AREA CO-ORDINATES VERTCAL FORMAT

Graphic Image using vertical data

F1H 00H D8H 00H 00H EBH 0FH ‘v’ 00H 00H 00H 00H 07H 04H C7H
FEH 72H 73H 32H 3EH 3FH 1DH

00H 00H 00H 00H 00H 00H 00H
3CH 42H 81H B9H C1H 42H 7CH
20H D8H FCH 3CH FCH CAH 49H

Displaying graphic images in vertical and horizontal format.

AREA COMMANDS

The VFD module contains commands to fill, clear and invert defined areas of the display. Also an outline command is available to draw rectangles
around objects.

The following example displays three options for the user to select, each option is contained within a box with a shadow effect. Drawing horizontal
and vertical lines using the fill area command creates the shadow effect. Command bytes that are underlined should be sent with RS line low.

1-PIXEL SPACING

DISPLAY TEXT SET CURSOR 5x7 FONT

F2H ‘B’ F2H ‘1’ F0H 00H 56H 0BH ‘SETUP’
F0H 00H 80H 0BH ‘PRINT’
F0H 00H ABH 0BH ‘RUN’

Display options with simple graphic text write.

F1H 00H 54H 02H 00H 74H 0CH ‘O’
F1H 00H 6CH 02H 00H 9CH 0CH ‘O’
F1H 00H A4H 02H 00H C2H 0CH ‘O’

Boxes created using the ‘Set Area Outline’ command.

F1H 00H 54H 0DH 00H 75H 0DH ‘F’ F1H 00H 75H 03H 00H 75H 0DH ‘F’
F1H 00H 7CH 0DH 00H 9DH 0DH ‘F’ F1H 00H 9DH 03H 00H 9DH 0DH ‘F’
F1H 00H A4H 0DH 00H C3H 0DH ‘F’ F1H 00H C3H 03H 00H C3H 0DH ‘F’

Drop Shadows created with the ‘Fill Area’ command.

The next example uses the invert area command to select one of the options.

NORITAKE ITRON VFD MODULES GU280x16G-7806A

F1H 00H A5H 03H 00H C1H 0BH ‘I’

Option ‘Run’ selected with the ‘Invert Area’ command.

PORT I/O MODE

MOSI I/O RXD I/O SCK I/O 1 HB I/O MB I/O TXD I/O MISO I/O

A ‘1’ defines the port as an input, ‘0’ an output. All ports are subsequently

MOSI OUT

RXD OUT

SCK OUT

-

HB OUT MB OUT TXD OUT

MISO OUT

D7 D6 D5 D4 D3 D2 D1 D0

EXTENDED PORT AND SERIAL COMMANDS

VCC

SW1

MOSI IN RXD IN SCK IN - HB IN MB IN TXD IN MIS

O IN

D7 D6 D5 D4 D3 D2 D1 D0

SYNCHRONOUS SERIAL MODE

transmission.

Data is transmitted to the synchronous serial port. If the ‘HNDSHK’ bit is

h with a ‘1’ and low with a ‘0’. Busy detection is

enabled by setting HNDSHK to a ‘1’. The default clock level is high with

DEF H/L set to a ‘1’, low if ‘0’. The CLK EDGE is set to rising with a ‘1’,

SPEED1/0 bits,

he current port status is read with RS high. TX PEND shows data is

pending for transmission, TXC transmission completed, and RXC shows

data received. HB IN shows the current state of the ‘HB’ line. TXC is

The currently buffered data byte can be read with RS high. The host

should first check the RXC bit using the PORT STATUS command. After

CLK EDGE

SPEED1 SPEED0 0 0 TXD OUT

HNDSHK DEF H/L

D7 D6 D5 D4 D3 D2 D1 D0

TXC RXC - - - - HB IN TX PEND

D7 D6 D5 D4 D3 D2 D1 D0

to the

ission is

delayed until HB line is low.

sets the corresponding port high, and a ‘0’ sets it low. If the port is

Dot Graphic VFD Module GU280x16G-7806A

The extended port and serial commands are only valid when the display is connected to the host using the parallel interface.

Command Structure and Values Copyright 2007 Noritake Co Limited, Japan

The I/O mode gives direct access to the 7 control lines on the serial
connector; HB, MB, TXD, RXD, MISO, MOSI and SCK. Each line can be
individual set to an Input or Output using the ‘PORT CONFIGURE’
command. All inputs include an optional pull-up resistor, 30K-120K in
value. The outputs can source ~5mA and sink ~30mA. There are 3
commands available to configure port, set port level and read port state.

PORT CONFIGURE F4H + I/O

D7 D6 D5 D4 D3 D2 D1 D0

set low.

PORT OUT F6H + OUT

Example: -

F4H 82H - Set RXD to input and other ports to
F6H 02H - Turn on LED1&2 by setting HB & MB

F7H - Read port, D1 is the switch state.

outputs.
low. Enable internal pull-up resistor on

RXD.

LED1 LED2

HB
MB

RXD
GND

A ‘1’

7806A

set to an input, a ‘1’ will enable the internal pull-up resistor.

PORT IN F7H

The current port levels are read with RS high.

This mode gives the ability to control external synchronous devices
connected to the serial connector. Data is transmitted and received on
each ‘PORT OUT’ command. The received data byte is buffered until
the ‘PORT READ’ command is executed.

The ‘PORT BUFFER SEND’ command will buffer up to 128 bytes of
data prior to transmission; only the last data byte received is captured
when using this command.

The ‘PORT CONFIGURE’ command will set the MOSI & SCK lines to
outputs, and the MISO line to an input. The HB line is used as an
optional busy input, and the MB line is set to an output. The TXD line is
also set to an output, and this can be used as a reset or device select
control line.

The serial transmission is defined by the ‘DEF H/L’ (default clock level
high or low), ‘CLK EDGE’ (rising or falling clock edge), and the ‘SPEED’
(clock speed) control bits. The ‘HNDSHK’ bit is used to detect the status
of the HB line prior to data transmit. All data is transmitted MSB first.

A ‘STATUS READ’ command can be used to check for completed data

Example: -

F4H 1BH - Enable Synchronous mode with busy test; clock speed to
F6H 55H - Send byte 55H to synchronous port when HB line is low.

F5H - Read current status. Wait until TXC is set.
F5H - Read current status. Check if RXC is set.
F7H - Read received byte.

F8H 16H “This is a test string.” - Send character string when HB line is low.
F5H - Read current status. Wait until TXC is set.

125kHz, data clocked on falling edge, default clock level is low.

PORT CONFIGURE F4H + SETUP

The TXD port is set hig

and falling with a ‘0’. The clock speed is set with the
00=4Mhz, 01=1Mhz, 10=250kHz, 11=125kHz.

SERIAL SEND F6H + DATA

enabled, transmission will be delayed until the HB line is pulled low.

PORT BUFFER SEND F8H + SIZE + DATA

A maximum of 128-bytes of data is buffered before transmission
synchronous serial port. If the ‘HNDSHK’ bit is enabled, transm

READ PORT STATUS F5H

T

cleared after status read.

SERIAL READ F7H

reading the data byte, the RXC bit is cleared.

NORITAKE ITRON VFD MODULES GU280x16G-7806A

hronous serial port. If the ‘HNDSHK’ bit is

low with a ‘0’. Busy detection is

enabled by setting HNDSHK to a ‘1’. The parity is set with the PARITY1/0

bits, 00=none, 10=even & 11=odd. The baud rate is set with the

The current port status is read with RS high. TX PEND shows that data is

smission was completed, and RXC

shows data has been received. RX ERR indicates a received parity,

overrun or framing error. HB IN shows the current state of the ‘HB’ line.

The currently buffered data byte can be read with RS high. The host

k the RXC bit using the PORT STATUS command. After

ASYNCHRONOUS SERIAL MODE

PARITY0

BAUD1 BAUD0 0 1 MISO OUT

HNDSHK

PARITY1

D7 D6 D5 D4 D3 D2 D1 D0

TXC RXC RX ERR - - - HB IN TX PEND

D7 D6 D5 D4 D3 D2 D1 D0

to the

asynchronous serial port. If the ‘HNDSHK’ bit is enabled, transmission is

Dot Graphic VFD Module GU280x16G-7806A

This mode gives the ability to control external asynchronous devices
connected to serial connector. Data is transmitted on each ‘PORT OUT’
command. Data received is held within a 1 byte buffer until the ‘PORT
READ’ command is executed.

The ‘PORT BUFFER SEND’ command will buffer up to 128 bytes of
data prior to transmission.

The ‘PORT CONFIGURE’ command will set the TXD & MB lines to
outputs, and the RXD line to an input. The MISO line is also set to an
output, and this can be used as a reset or device select control line. The
HB line is used as an optional busy input. The MB line mirrors the RXC
status flag, and indicates that data has been received.

A ‘STATUS READ’ command can be used to check for completed data
transmission.

Data Write Example: -

F4H 5AH - Enable Asynchronous mode with busy test; set interface to 19200E.
F6H 55H - Send byte 55H to asynchronous port when HB line is low.
F5H - Read current status. Wait until TXC is set.
F6H AAH - Send byte AAH to asynchronous port when HB line is low.

F8H 16H “This is a test string.” - Send character string when HB line is low.
F5H - Read current status. Wait until TXC is set.

Data Read Example: -

F5H - Read current status. Repeat until RXC is set.
F7H - Read received byte.

PORT CONFIGURE F4H + SETUP

The MISO port is set high with a ‘1’ and

BAUD1/0 bits, 00=4800, 01=9600, 10=19200 & 11=38400.

SERIAL SEND F6H + DATA

Data is transmitted to the async
enabled, transmission will be delayed until the HB line is pulled low.

PORT BUFFER SEND F8H + SIZE + DATA

A maximum of 128-bytes of data is buffered before transmission
delayed until HB line is low.

READ PORT STATUS F5H

pending for transmission, TXC tran

The TXC bit is cleared after status read.

SERIAL READ F7H

should first chec
reading the data byte, the RXC bit is cleared.

NORITAKE ITRON VFD MODULES GU280x16G-7806A