HT16K33 datasheet(21/47 Pages) HOLTEK

21 / 47 page

Rev. 1.10

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Rev. 1.10

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HT16K33

RAM Mapping 16*8 LED Controller Driver with keyscan

Keyscan Timing

The Slave addresses are updated on the keyscan timing as shown:

KS0

KS1

KS2

Input mode

COM1/KS0

COM2/KS1

COM3/KS2

ROW0~15

1 Cycle

Key scan period

Display period

1 Frame

∫∫

Slave address are

updated

Slave address are

updated

Slave address are

updated

KS0

KS1

Input mode

2 Cycle

Key scan period

Display period

1 Frame

KS0

KS1

KS2

Input mode

3 Cycle

Key scan period

Display period

1 Frame

Slave address are

updated

∫∫

KS0

KS1

KS2

Input mode

n Cycle

Key scan period

Display period

1 Frame

COM0/AD

KS2

Keyscan & INT Timing

● The key data is updated and the INT function is changed for keys that have been pressed after 2

key-cycles.

● The INT function is changed when the first key has been pressed.

● When after all the key data has been read that clears the key data RAM and the int flag bit is set to

“0”, the INT pin goes to low when the “act” bit of the row/int set register is set to “1”.

● When after all the key data has been read that clears the key data RAM and the int flag bit is set to

“0”, the INT pin goes to high when the “act” bit of the row/int setup register is set to “0”.

● The INT flag register is shown below.

● I2C bus display data transfer format

INT flag register

(address point at �0H)

INT flag INT flag INT flag INT flag INT flag INT flag INT flag INT flag

● The relationship between keyscan signal to the INT signal time is shown below:

1. When a key is pressed on the KS0 row

KS0

KS1

KS�

Press ke�

INT_flag

1 cycle

2 cycle

INT pin

(active low)

INT pin

(active high)

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