MC3411A 查看數據表（PDF） - Unspecified

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MC3411A

16 SEGMENT X 12 GRID VFD DRIVER WITH KEYSCAN

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MC3401A/3411A

FUNCTIONAL DESCRIPTION

COMMANDS

Commands determine the display mode and status of MC3401A/3411A. A command is the first byte (b0 to b7)

inputted to MC3401A/3411A via the DIN Pin after STB Pin has changed from “HIGH” to “LOW” State. If for some

reason the STB Pin is set to “HIGH” while data or commands are being transmitted, the serial communication is

initialized, and the data/commands being transmitted are considered invalid.

COMMAND 1 : DISPLAY MODE SETTING COMMAND

MC3401A/3411A provides 8 display mode settings as shown in the diagram below: As stated earlier a command is

the first one byte (b0 to b7) transmitted to MC3401A/3411A via the DIN Pin when STB is “LOW”. However, for these

commands, the bits 5 to 6 (b4 to b5) are ignored, bits 7 & 8 (b6 to b7) are given a value of “0”.

The Display Mode Setting Commands determine the number of segments and grids to be used (1/4 to1/12 duty, 16

to 24 segments). When these commands are executed, the display is forcibly turned off, the key scanning stops. A

display command “ON” must be executed in order to resume display. If the same mode setting is selected, no

command execution is take place, therefore, nothing happens.

When Power is turned “ON”, the 12-digit, 16-segment modes is selected.

MSB

LSB

0

0

-

-

b3 b2 b1 b0

00 : COMMAND 1 Don’t Care

Display Mode Settings

0000 : 4Grid, 24 Segments

0001 : 5Grid, 23 Segments

0010 : 6Grid, 22 Segments

0011 : 7Grid, 21 Segments

0100 : 8Grid, 20 Segments

0101 : 9Grid, 19 Segments

0110 : 10Grid, 18 Segments

0111 : 11Grid, 17 Segments

1XXX : 12Grid, 16 Segments

February 28, 2013 Ver. 1.10

15/29

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