HT16528-003 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT16528-003

Dot Character VFD Controller & Driver

Holtek Semiconductor 

HT16528

Display Data RAM (DDRAM)

The Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its extended capacity is

80´8 bits or 80 characters. The area in the DDRAM that is not used for display can be used as general data RAM. Refer

to DDRAM address table for the relationships between DDRAM address and positions on the VFD.

The DDRAM address (ADD) is set in the address counter (AC) as hexadecimal.

High Order Bits

DDRAM Address Table

Low Order Bits

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Hexadecimal

Hexadecimal

Example: DDRAM address ²3FH²

0

1

1

1

1

1

1

3

F

· 1-line display (N=0)

Display Position

(Digit) 1

2

3

4

5

6

DDRAM Address 00

01

02

03

04

05

(Hexadecimal)

79

80

4E

4F

When there are fewer than 80 display characters, the display begins at the head position. For example, if using only

one HT16528, 24 characters are displayed. When display shift operation is performed, the DDRAMaddress shifts as

shown in the following table.

Example: 1-line by 24-character Display Table

Display Position

(Digit) 1

2

3

4

5

6

DDRAM Address 00

01

02

03

04

05

(Hexadecimal)

For Shift Left 01

02

03

04

05

06

23

24

16

17

17

18

For Shift Right 4F

00

01

02

03

04

15

16

Rev. 1.10

21

July 5, 2011

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