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Revision 2.11

10 - 19

AS1108

Data Sheet - D e t a i l e d D e s c r i p t i o n

Display-Test Register (0xXF)

The AS1108 can operate in two modes: normal mode and display test mode. In display test mode all LEDs are

switched on at maximum brightness (duty cycle is 15/16). The device remains in display-test mode until the Display-

Test Register is set for normal operation.

Note: All settings of the Digit- and Control-Registers are maintained.

6

X

01

10

10

11111

7

X

01

11

11

10000

8

X

10

00

11

11111

9

X

10

01

11

11011

-

X

10

10

00

00001

E

X

10

11

10

01111

H

X

11

00

01

10111

L

X

11

01

00

01110

P

X

11

10

11

00111

Blank

X

1

1

1

1

0

0

00000

†

The decimal point is enabled by setting bit D7 = 1.

Table 11. HEX Font

7-Segment

Character

Register Data

On Segments = 1

D7

†

D6:D4

D3

D2

D1

D0

DP

†

A

B

C

D

E

F

G

0

X

0

0

0

0

11111

10

1

X

0

0

0

1

01100

00

2

X

0

0

1

0

11011

01

3

X

0

0

1

1

11110

01

4

X

0

1

0

0

01100

11

5

X

0

1

0

1

10110

11

6

X

0

1

1

0

10111

11

7

X

0

1

1

1

11100

00

8

X

1

0

0

0

11111

11

9

X

1

0

0

1

11110

11

A

X

1

0

1

0

11101

11

b

X

1

0

1

1

00111

11

C

X

1

1

0

0

10011

10

d

X

1

1

0

1

01111

01

E

X

1

1

1

0

10011

11

F

X

1

1

1

1

10001

11

†

The decimal point is enabled by setting bit D7 = 1.

Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines

D7

D6

D5

D4

D3

D2

D1

D0

Corresponding Segment Line

DP

A

B

C

D

E

F

G

Table 13. Display-Test Register Format (Address (HEX) = 0xXF))

Mode

Register Data

D7

D6

D5

D4

D3

D2

D1

D0

Normal Operation

XXXXXXX

0

Display Test Mode

XXXXXXX

1

Table 10. Code-B Font (Continued)

7-Segment

Character

Register Data

On Segments = 1

D7

†

D6:D4

D3

D2

D1

D0

DP

†

A

B

C

D

E

F

G