AD6312

1/4- to 1/11 Duty VFD Controller/Driver

Anachip Corp.

www.anachip.com.tw

Rev. A4 Dec 29, 2003

5/13

Function Descriptions

1.0 Commands

Commands set the display mode and status of the VFD driver. The first 1 byte input to the AD6312 through

are transmitted, serial communication is initialized, and the commands/data being transmitted are invalid

(however, the commands/data previously transmitted remain valid).

1.1 Display mode setting commands

These commands initialize the AD6312 and select the number of segments and the number of grids (4 grids

& 16 segments to 11 grids & 11 segments to). When these commands are executed, the display is forcibly

turned off, and key scanning is also stopped. To resume display, the display command “ON” must be

executed. If the same mode is selected, however, nothing happens.

LSB

00

-

-

- b2 b1 b0

MSB

Irrelevant

Display mode settings

000: 4 digits, 16 segments

001: 5 digits, 16 segments

010: 6 digits, 16 segments

011: 7 digits, 15 segments

100: 8 digits, 14 segments

101: 9 digits, 13 segments

110: 10 digits, 12 segments

111: 11 digits, 11 segments

On power application, the 11-digit, 11-segment mode is selected.

1.2 Data setting commands

These commands set data write and data read modes. On power application, the normal

operation and address increment modes are set.

0

1

-

-

b3 b2 b1 b0

Irrelevant

MSB

LSB

Data write and read mode settings.

00: Write data to display memory.

01: Write data to LED port.

10: Read key data.

11: Read SW data.

Address increment mode settings (display memory).

0: Incremenets address after data has been written.

1: Fixes address.

Test mode settings

0: Normal operation

1: Test mode