Display Position

(Digit)

123456

39

40

DDRAM Address

00

01

02

03

04

05

26

27

(Hexadecimal)

40

41

42

43

44

45

66

67

When the number of display character is less than 40

´2 lines, the 2 lines are displayed from the head. The first line

end address and the second line start address are not consecutive.

For example, if using only one HT16514, 24 characters

´ 2 lines are displayed. When display shift operation is per-

formed, the DDRAM address shifts as shown in the following table.

Example: 2-line by 24-character Display Table

Display Position

(Digit)

123456

23

24

DDRAM Address

00

01

02

03

04

05

16

17

(Hexadecimal)

40

41

42

43

44

45

56

57

For Shift Left

01

02

03

04

05

06

17

18

41

42

43

44

45

46

57

58

For Shift Right

27

00

01

02

03

04

15

16

67

40

41

42

43

44

55

56

The DDRAM stores the character code of each character being displayed on the VFD. Valid DDRAMaddresses are

00H to 27H and 40H to 67H. The DDRAMnot used for display characters can be used as general purpose RAM. The

tables below show the relationship between the DDRAMaddress and the character position on the VFD display shift

as shown in the following table.

Example: 2-line by 40-character Display Table

Display Position

(Digit)

1234

23

24

25

39

40

DDRAM Address

00

01

02

03

16

17

18

26

27

(Hexadecimal)

40

41

42

43

56

57

58

66

67

For Shift Left

00

01

02

03

17

18

19

27

00

41

42

43

44

57

58

59

57

40

For Shift Right

27

00

01

02

15

16

17

25

26

67

40

41

42

55

56

57

65

66

HT16514 Display

Extension Driver Display

HT16514

Rev. 1.00

22

October 4, 2006