GU128X64-800B Datasheet GU128X64-800B | P10-P12

GU128X64-800B

9.3 Cont’d

Brightness levels are set by the following:

BW3 BW2 BW1 BW0 Brightness Level

0 0 0 0 100%(Light)

0 0 0 1 94%

0 0 1 0 87%

0 0 1 1 81%

0 1 0 0 75%

0 1 0 1 69%

0 1 1 0 62%

0 1 1 1 56%

1 0 0 0 50%

1 0 0 1 44%

1 0 1 0 37%

1 0 1 1 31%

1 1 0 0 25%

1 1 0 1 19%

1 1 1 0 12%

1 1 1 1 6%(Dark)

9.4

Display Clear (C/D= "1") This command clears the GRAM.

This command should always be applied at power on or reset. In the period of 1mS following the

issue of this command, the module requires internal processing and does not accept any

commands.

MSB LSB

0 1 0 1 G1C G0C 1 HM

< --------------------------- > < ---------------------------- >

Command Select Clear Control Code

To clear the GRAM area, G1C or G0C bit must be asserted. By asserting HM bit, both data write position

address and display start position address which selected by G1C, G0C, DC also be reset.

HM = (1 or 0) equals (Initialize data write position address and display start position address or Not initialize).

G1C= (1 or 0) equals (GRAM area 1 is cleared or GRAM area 1 not cleared)

G0C= (1 or 0) equals (GRAM area 0 cleared or GRAM area 0 not cleared)

GRAM area 1: X= 00H-7FH, Y=0H – 7H (Display data write position address)

GRAM area 2: X= 00H-7FH, Y=8H – FH (Display data write position address)

GU128X64-800B

9.5 Display Area Set (C/D="1", only used for Initialize Set)

This command sets the display area block as Graphic Display (GRAM) or Character display

(DDRAM). But, this is version which has no Font ROM. Therefore, DDRAM is not available, all of

display area block must be assigned to GRAM as the initialize setting, and this must be done when

the module is powered up and also every time the reset is applied. Setup is performed by 3-byte

command.

1st Byte: (C/D="1") Command Select

MSB LSB

0 1 1 0 0 0 1 0

< ------------------------------------------------------------ >

Command Select

2nd Byte: (C/D="1") Display Area Data Address Select

MSB LSB

0 0 0 0 0 A2 A1 A0 (0H – 7H)

< ------------------ >

Display Area Data Address

3rd Byte: (C/D="0") Display Area Block Select

MSB LSB

1 1 1 1 1 1 1 1

< ------------------------------------------------------------- >

Display Data

D0 to D7 = "1": Graphic Display (GRAM)

D0 to D7 = "0": Character Display (DDRAM, Not available)

Display area block is assigned as follows on a screen.

Dis

ea Data Add

ess

(

0to7H

)

345 6

8dot

16 dot

GU128X64-800B

9.6 GRAM Data Write position Address Set (Graphic Display) (C/D="1")

This command specifies both X & Y data write position address.

9.6.1 GRAM Data Write Position X Address Set

Data write position X address of GRAM expressed with 8 bits (00Hex-7FHex) is specified.

Refer to 8.1 Graphic Display (GRAM) on Page #5.

1st Byte: Command Select

MSB LSB

0 1 1 0 0 1 0 *

* Either a “0” or a “1” is acceptable

< ------------------------------------------------------------- >

2nd Byte:

GRAM Data Write Position X Address

MSB LSB

0 GXA6 GXA5 GXA4 GXA3 GXA2 GXA1 GXA0

< ------------------------------------------------------------- >

9.6.2 GRAM Data Write Position Y Address Set

Data write position Y address of GRAM expressed with 4 bits (0Hex-FHex) is specified.

1st Byte:

MSB LSB

0 1 1 0 0 0 0 *

* Either a “0” or a “1” is acceptable

< -------------------------------------------------------------- >

Command Select

2nd Byte:

MSB LSB

* * * * GYA3 GYA2 GYA1 GYA0 * Either a “0” or a “1” is acceptable

< -------------------------- >

9.7 GRAM Display Start Position Address Set (C/D="1")

9.7.1 Horizontal Shift

This command specifies the address that a display pattern can be positioned to by 8 bits (00Hex

to 7FHex). This is equivalent to an offset in the X-axis.

1st Byte:

MSB LSB

0 1 1 1 * * * *

* Either a “0” or a “1” is acceptable

< --------------------------- >

Command Select

2nd Byte:

MSB LSB

XA7 XA6 XA5 XA4 XA3 XA2 XA1 XA0

< -------------------------------------------------------------- >

GRAM Display Start Position Address

9.7.2 Vertical Shift

This is equivalent to an offset Y-axis.

MSB LSB

1 0 1 1 UD S1 S0 *

* Either a “0” or a “1” is acceptable

< --------------------------- > < ------------------ >

Command Select Display Shift Data

UD= "1": Display scrolled up.

UD= "0": Display scrolled down.

S1= "0", S0= "1": Display shift by 8 dots.

S1= "1", S0= "0": Display shift by 1 dot.

S1= "1", S0= "1": Display shift by 2 dots.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P22

GU128X64-800B

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Vacuum Fluorescent Displays - VFD Vacuum Fluorescent Dislay Module

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GU128X64-800B