AD6311 datasheet(7/11 Pages) ETC

7 / 11 page

AD6311

1/8- to 1/16 Duty VFD Controller/Driver

Anachip Corp.

www.anachip.com.tw

Rev. A5 Dec 29, 2003

7/11

Lower 4 bits

Higher 4 bits

Only the lower 4 bits of the addresses assigned to Seg17 through Seg20 are valid, and the higher 4 bits

are ignored.

3.0 LED Port

Data is written to the LED port by a write command, starting from the least significant bit of the port.

When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off . The data

of bits 6 through 8 is ignored.

- b4 b3 b2 b1 b0

MSB

LSB

Don't care

LED1

LED2

LED3

LED4

LED5

On power application, all the LEDs remain dark.

4.0 Key Matrix and Key-Input data Storage RAM

The key matrix is of 12×4 configuration, as shown below.

KEY1

KEY2

KEY3

KEY4

The data of each key is stored as illustrated below, and is read by a read command, starting from the least

significant bit. When the most significant bit of data (Seg12 b7) has been read, the least significant bit of the

next data (Seg1 b0) is read.

KEY1

...KEY4

KEY1

...KEY4

Seg1/KS1

Seg3/KS3

Seg5/KS5

Seg7/KS7

Seg9/KS9

Seg11/KS11

Seg2/KS2

Seg4/KS4

Seg6/KS6

Seg8/KS8

Seg10/KS10

Seg12/KS12

b4--------b7

b0--------b3

Reading sequence

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