PDSP2110, PDSP2111, PDSP2112, PDSP2113, PDSP2114

2006-01-23

11

Control Word Format

Flash RAM Function

Character Flash is controlled by FL pin, bit D0 and control word bit D3. Combination of FL being low, proper digit address and D0 being

high will write a flash bit into the Flash RAM Register. In the control word mode when D3 is brought high, the above mentioned character

will flash.

Display Brightness

The display can be programmed to vary between blank, 13%, 20%, 27%, 40%, 53%, 80% and full brightness.

Bits D0, D1 and D2 control the display brightness.

CE

WR

FL

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Display Brightness

00

1

00

1

00

1

00

1

00

1

00

1

00

1

00

1

0X

X

X

0X

X

X

0X

X

X

0X

X

X

0X

X

X

0X

X

X

0X

X

X

0X

X

X

0

0

XXX0

0

0

0

0

XXX0

0

1

0

0

XXX0

1

0

0

0

XXX0

1

1

0

0

XXX1

0

0

0

0

XXX1

0

1

0

0

XXX1

1

0

0

0

XXX1

1

1

100% Brightness

80%

Brightness

53%

Brightness

40%

Brightness

27%

Brightness

20%

Brightness

13%

Brightness

Blank Display

X=Don’t Care

Setting the Flash Bit

CE

WR

FL

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

00

0

00

0

XA

A

A

XA

A

A

X

X

XXXX

X

0

X

X

XXXX

X

1

Flash RAM Disabled

Flash RAM Enabled

X=Don’t Care A=Selected Address

Character Flash Control Word

CE

WR

FL

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

00

1

00

1

0X

X

X

0X

X

X

0

0

X

00B

B

B

0

0

X

01B

B

B

Disable Flashing Character

Enable Flashing Character

X=Don’t Care B=Selected Brightness

Display Blinking

Blinking Function is independent of Flash function. When D4 is held high, entire display blinks at 2.0 Hz.

CE

WR

FL

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

00

1

00

1

0X

X

X

0X

X

X

0

0

X

00B

B

B

0

0

X

10B

B

B

Display Blinking Disabled

Display Blinking Enabled

X=Don’t Care B=Selected Brightness

Lamp Test

Bit D6 when brought high will cause all the LEDs in all eight digits to light up at 53% brightness.

Selecting or de-selecting Lamp Test bit has no effect on the display memory.

CE

WR

FL

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

00

1

00

1

0X

X

X

0X

X

X

0

0

X0

XX

X

X

0

1

X

00X

X

X

Lamp Test Disabled

Lamp Test Enabled

X=Don’t Care