Datasheet GU140x16G-7806A Datasheet (NORITAKE-ITRON)

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Dot Graphic VFD Module GU140x16G-7806A

 140x16 Dot Graphic (2x20 characters)
 Single 5V Supply
 High Brightness Blue Green Display
 Operating Temp -40°C to +85°C
 3 Multi Sized Fonts

The module includes the Vacuum Fluorescent Display glass, VF drivers
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.

 4/8 Bit Parallel LCD & Serial Interfaces

CN1

Pin 1

69.85 18.8

108.0

116.0

96.0

ELECTRICAL SPECIFICATION

Parameter Symbol Value Condition

Power Supply Voltage VCC 5.0VDC +/- 5% GND=0V
Power Supply Current ICC 250mADC typ. VCC=5V
Logic High Input VIH 0.8xVCC min. Vcc max. VCC=5V
Logic Low Input VIL 0VDC min 0.6VDC max. VCC=5V
Logic High Output VOH 3.5VDC min. Vcc max. IOH=-10uA
Logic Low Output VOL 0VDC min 0.6VDC max. IOL =4mA

OPTICAL and ENVIRONMENTAL SPECIFICATIONS

Parameter Value
Display Area (XxY mm) 69.85 x 11.45
Dot Size/Pitch (XxY mm) 0.35 x 0.575 / 0.5 x 0.725
Luminance 700 cd/m2 Typ.
Colour of Illumination Blue-Green (Filter for colours)
Operating Temperature
Storage Temperature
Operating Humidity (non condensing)

SOFTWARE COMMAND SUMMARY

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

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. onl
Read Data FEH Serial Comms. onl
Read Cursor Position FFH Serial Comms. only

-40°C to +85°C

-40°C to +85°C
20 to 80% RH @ 25°C

F1H + x1 + y1 + x2 + y2 + cmd

here cmd 49H = Invert Area
46H = Fill Area
43H = Clear Area
4FH = Set Outline Bo
6FH = Clear Outline Bo

CN5CN3CN2 Pin 1 Pin 1 Pin 1

11.45

29.

8.8

4.

.7 max.

2.

x.

CHARACTER SET

5x7 & 10x14 Font LCD Font

UDF1

UDF2

UDF3

UDF4

UDF5

UDF6

UDF7

UDF8

UDF1

UDF2

UDF3

UDF4

UDF5

UDF6

UDF7

UDF8

NOTE: UDF characters are available using 5x 7 font only.

Proportional Mini Font

Serial / Parallel Selection

J6 Interface

Open Sync Serial / Parallel (default)

Link Asynchronous Serial

Parallel Interface type (M68 / i80)

J2 J4 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

SERIAL MODE

J12

Configuration

3-4 1-2 7-8

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 2008 Noritake Itron Corp. Japan

CN5 – RS232 INT.

Pin Async

1 VCC
2 RS232 In
3 GND

CN3 – SERIAL INTERFACE

Pin Async SPI

1 VCC VCC
2 NC SCK
3 RXD /SS
4 LINK1 SIN
5 GND GND
6 LINK2 SOUT
7 TXD NC

Dimensions in mm &

subject to tolerances.

Mounting holes

3.2mm dia.

4.

CN1/2 - PARALLEL INTERFACE

Pin Sig Pin Sig

8 /RES /RES
9 MB MB

10 HB HB

NC = Do Not Connect

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

1.6

11 D4 12 D5
13 D6 14 D7

Pin 3 can be changed to /RESET or
BUSY terminal and selectable by
jumper J3 (2-3) or J3 (1-2)

International Font

CN1 Pin 3 Function

J3 Font

2 & 3 / Reset

1 & 2 Busy
All J12 links & J6 should be open for
parallel operation.

Noritake Sales Office Tel Nos

Nagoya Japan: [phone]

Chicago USA: [phone]

Munchen (D): [phone]

Rest Europe: [phone]

Subject to change without notice.

IUK Doc Ref: 43203 Iss:4 19Dec08

CONTACT

Canada: [phone]

Itron UK: [phone]

www.noritake-itron.com

NORITAKE ITRON VFD MODULES GU140x16G-7806A

Dot Graphic VFD Module GU140x16G-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 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.

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

data (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 F1H + x1 + y1 + x2 + y2 + cmd Image Commands: - ‘H’ – write horizontal graphical data with horizontal cursor movement.

*Note

Set Font

(40us)

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

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 200us.

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 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

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%.

30H + lum (RS=1) Enables 8-bit communications. Data is received on DB0-DB7. 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%.

40H – 7FH Set the character generator address (CG RAM). All written data is placed within the user definable character

area.

80H – E7H Set the display data address (DD RAM). 80H – 93H = top line. C0H - D3H = bottom line.

*Note

F0H + xpos + ypos Set the absolute cursor position. xpos = 0 – 139, ypos = 0 – 15.

Co-ordinates should be written with RS line set high.

F1H + x1 + y1 + x2 + y2 + cmd 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, command and graphical data should be written with RS line set high.

‘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.

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.

Note: 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 will
re-enable the cursor and allow for DD RAM writing.

NORITAKE ITRON VFD MODULES GU140x16G-7806A

p

Dot Graphic VFD Module GU140x16G-7806A

GRAPHICAL DATA WRITES

X1, Y1

MSB

DATA

DIRECTION

Vertical Data & Horizontal

Movement

PARALLEL COMMUNICATIONS

X1, Y1

MSB

DATA

DIRECTION

Vertical Data & Vertical

Movement

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

GU140x16G-7806A

E
RS
R/W
BUSY

VDD GND VDD GND

X1, Y1

MSB

Horizontal Data & Horizontal

DATA

DIRECTION

Movement

8-Bit Data Write Timing Diagram.

R/W

RS

>30ns

E

D0-D7

BUSY

>25ns

>20ns

X1, Y1

DIRECTION

MSB

Horizontal Data & Vertical

Movement

>30ns

<25ns

tBUSY

DATA

The busy state can be monitored on D7 when reading the DDRAM
address (RS line low). The busy state can also be monitored directly
from CN1/CN2

HOST
SYSTEM

in 3 if link J6 is set to 2&3.

I/O

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

D4-7

E
RS
R/W
BUSY

GU140x16G-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

>25ns

>100ns

8-Bit Data Read Timing Diagram.

R/W

>30ns

RS

>200ns

E

<65ns >50ns

D0-D7

>25ns

VALID

E

D4-D7

BUSY

>20ns

UPPER NIBBLE

>100ns

>20ns

LOWER NIBBLE

<120ns

>100ns

tBUSY

NORITAKE ITRON VFD MODULES GU140x16G-7806A

Dot Graphic VFD Module GU140x16G-7806A

4-Bit Data/Status Read Timing Diagram.

R/W

RS

E

D4-D7

>30ns

>250ns

<250ns

>50ns

UPPER NIBBLE

Valid Valid

100ns

>250ns

>250ns

>50ns

LOWER NIBBLE

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 CN3 (LINK1 and LINK2), Link J6 and enable i80 Mode on J2 and J4. When
using Asynchronous serial communications, the module is automatically initialized at power-up/reset with the cursor enabled.

HOST
SYSTEM

TXD

RXD

DTR

CTS

RXD
TXD

GU140x16G-7806A

HB
MB

VDD GND 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

GU140x16G-7806A

/SS
MB

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

MSB LSB

>250ns >250ns

<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 DISPL AY TEXT

SET CURSOR

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

Displaying text using serial communications.

NORITAKE ITRON VFD MODULES GU140x16G-7806A

Dot Graphic VFD Module GU140x16G-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.

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.

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.

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.

0,0

0,7

6,7

Cursor Positioning, example of writing 2 characters

from cursor position 0,7.

5x7 FONT DISPLAY TEXT SET CURSOR

‘B’ F0H 15H 07H ‘NORITAKE ITRON’

F2H
F0H

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 22H 0FH ‘140x16’

1FH 0FH ‘VFD MODULES’

Displaying text using the 5x7 font.

Displaying text in the large 10x14 font.

NORITAKE ITRON VFD MODULES GU140x16G-7806A

Dot Graphic VFD Module GU140x16G-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
multiple

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 AREA CO-ORDINATES HORIZONTAL FORMAT

GRAPHIC DATA

MSB

MSB

Graphic Image using horizontal data

- 1CH

- 5CH

- 48H

- 3EH

- 1DH

- 1DH

- 14H

- 36H

F1H

30H 04H 37H 0BH ‘h’ 1CH 5CH 48H 3EH 1DH 1DH 14H 36H

BYTE2

BYTE1 BYTE21

BYTE19

BYTE20 BYTE40

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 VER TCAL F ORMAT

Graphic Image using vertical data

50H 00H 63H 0FH ‘v’ 00H 00H 00H 00H 07H 04H C7H FEH 72H 73H

F1H
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 B1H 89H 42H 3CH 00H

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.

Displaying graphic images in vertical and horizontal format.

1-PIXEL SPACING DISPLAY TEXT SET CURSOR 5x7 FONT

F2H ‘B’ F2H ‘1’ F0H 0DH 0BH ‘SETUP’
F0H
F0H

TOP LEFT SET AREA BOTTOM RIGHT

36H 0BH ‘PRINT’
65H 0BH ‘RUN’

Display options with simple graphic text write.

OUTLINE

0AH 02H 2CH 0CH ‘O’

F1H

33H 02H 55H 0CH ‘O’

F1H
F1H

5CH 02H 7EH 0CH ‘O’

HORIZONTAL LINE SET AREA FILL

HORIZONTAL LINE SET AREA FILL

Boxes created using the ‘Set Area Outli ne’ command.

F1H

0BH 0DH 2DH 0DH ‘F’ F1H 2DH 03H 2DH 0DH ‘F’
F1H 34H 0DH 56H 0DH ‘F’ F1H 56H 03H 56H 0DH ‘F’

F1H 5DH 0DH 7FH 0DH ‘F’ F1H 7FH 03H 7FH 0DH ‘F’

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

TOP LEFT SET AREA BOTTOM RIGHT INVERT

Drop Shadows created with the ‘Fill Area ’ command.

F1H 5DH 03H 7DH 0BH ‘I’

Option ‘Run’ selected with the ‘Invert Ar ea’ command.

NORITAKE ITRON VFD MODULES GU140x16G-7806A

A

r

A

delayed unt

A

Dot Graphic VFD Module GU140x16G-7806A

EXTENDED PORT AND SERIAL COMMANDS Command Structure and Values Copyright 2007 Noritake Co Limited, Japan

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

PORT I/O MODE

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.

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

SW1

VCC

HB
MB

RXD

GND

7806A

PORT CONFIGURE F4H + I/O

D7 D6 D5 D4 D3 D2 D1 D0

MOSI I/O RXD I/O SCK I/O1 HB I/O MB I/O TXD I/O MISO I/O

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

set low.

PORT OUT F6H + OUT

D7 D6 D5 D4 D3 D2 D1 D0

MOSI OUT RXD OUT SCK OUT- HB OUT MB O UT TXD OUT MISO OUT

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

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

PORT IN F7H

D7 D6 D5 D4 D3 D2 D1 D0

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

The current port levels are read with RS high.

SYNCHRONOUS SERIAL MODE

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
transmission.

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

D7 D6 D5 D4 D3 D2 D1 D0

CLK EDGE SPEED1 SPEED00 0 TXD OUT HNDSHK DEF H/L

The TXD port is set high 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’,
and falling with a ‘0’. The clock speed is set with the SPEED1/0 bits,
00=4Mhz, 01=1Mhz, 10=250kHz, 11=125kHz.

SERIAL SEND F6H + DATA

Data is transmitted to the synchronous serial port. If the ‘HNDSHK’ bit is
enabled, transmission will be delayed until the HB line is pulled low.

PORT BUFFER SEND F8H + SIZE + DATA

maximum of 128-bytes of data is buffered before transmission to the

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

il HB line is low.

READ PORT STATUS F5H

D7 D6 D5 D4 D3 D2 D1 D0

TXC RXC -- - - HB IN TX PEND

The 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
cleared after status read.

SERIAL READ F7H

The currently buffered data byte can be read with RS high. The host
should first check the RXC bit using the PORT STATUS command. Afte
reading the data byte, the RXC bit is cleared.

NORITAKE ITRON VFD MODULES GU140x16G-7806A

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Dot Graphic VFD Module GU140x16G-7806A

ASYNCHRONOUS SERIAL MODE

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

D7 D6 D5 D4 D3 D2 D1 D0

PARITY0 BAUD1 BAUD00 1 MISO OUT HNDSHK PARITY1

The MISO port is set high with a ‘1’ and 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
BAUD1/0 bits, 00=4800, 01=9600, 10=19200 & 11=38400.

SERIAL SEND F6H + DATA

Data is transmitted to the asynchronous serial port. If the ‘HNDSHK’ bit is
enabled, transmission will be delayed until the HB line is pulled low.

PORT BUFFER SEND F8H + SIZE + DATA

maximum of 128-bytes of data is buffered before transmission to the
asynchronous serial port. If the ‘HNDSHK’ bit is enabled, transmission is
delayed until HB line is low.

READ PORT STATUS F5H

D7 D6 D5 D4 D3 D2 D1 D0

TXC RXC RX ERR- - - HB IN TX PEND

The current port status is read with RS high. TX PEND shows that data is
pending for transmission, TXC transmission 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 TXC bit is cleared after status read.

SERIAL READ F7H

The currently buffered data byte can be read with RS high. The host
should first check the RXC bit using the PORT STATUS command. Afte
reading the data byte, the RXC bit is cleared.

NORITAKE ITRON VFD MODULES GU140x16G-7806A