UPD16681 datasheet(21/56 Pages) NEC

21 / 56 page

Data Sheet S13104EJ5V0DS00

µµµµPD16681

7.1 LCD Display and DDRAM Addresses

The character code used in the

µPD16681 contains 16 bits (character code + character attribute code). When data

is stored to an address in DDRAM, a combination of full width (11 x 12 dots) and half width (5 x 12 dots) characters

can be displayed on the LCD.

The relation between the DDRAM’s character area and the actual LCD display when displaying a combination of full

width and half width characters is shown below.

Figure 7-1. The Relation between The DDRAM’s Character Area and The Actual LCD Display

LCD display:

"" : Half width(5 x 12 dots) space

DDRAM:

123456

789

1st line

00H

01H

02H

03H

04H

05H

06H

07H

08H

09H

0AH 0BH 0CH 0DH 0EH 0FH

10H

11H

2nd line

12H

13H

14H

15H

16H

17H

18H

19H

1AH 1BH 1CH 1DH 1EH 1FH

20H

21H

22H

23H

3rd line

24H

25H

26H

27H

28H

29H

2AH 2BH 2CH 2DH 2EH 2FH

30H

31H

32H

33H

34H

35H

4th line

36H

37H

38H

39H

3AH 3BH 3CH 3DH 3EH 3FH

40H

41H

42H

43H

44H

45H

46H

47H

Remark

Shaded areas indicate addresses.

Address characters that are not displayed are used as data for character scrolling.

7.2 Character Codes

The

µPD16681 is able to combine full width characters (11 x 12 dots) and half width characters (5 x 12 dots) in the

same display. The character data that is stored in DDRAM is displayed starting from the top left corner of the LCD

screen. A one-dot character interval is added to the left of each character font.

Both full width (11 x 12 dots) and half width (5 x 12 dots) characters are handled using 16-bit code lengths and are

stored in DDRAM. The 16-bit code format uses the low-order 13 bits as the character code. The remaining 3 bits are

the high-order 3 bits, which specify the character width (full or half) and the display attribute. The MSB is the select

bit indicating full width or half width character code: “0” specifies full width characters and “1” specifies half width

characters. The character attribute code is assigned to the next two bits, and can specify attributes such as blinking

for individual characters. (See the section 7.3 Display Attributes.)

7.2.1 Code format

D15

D14

D13

D12

D11

D10

F/H

C12

C11

C10

Full width(11 x 12 dots) character/

Half width(5 x 12 dots) character specification

Display attribute codes

High-order character code

Low-order character code

UPD16681 Datasheet(PDF) 21 Page - NEC

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