HT16K33 datasheet(32/47 Pages) HOLTEK

32 / 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

Read Operation

Byte read operation

● A byte read operation requires a START condition, slave address with R/W bit, a fix valid Register

address, slave address with R bit, a Data and a NACK signal and a STOP condition.

● The Byte reads command is not available for Key data reading.

Slave Address

ACK

Write

Command / register address b�te

ACK

A� A1 A0

D15 D14 D13 D1� D11 D10 D9

Slave Address

Read

A� A1 A0

ACK

Data b�te

D�

1 b�te data

NACK

Reading Single Data Bytes from the HT16K33

Page read operation

● In this mode, the master reads the HT16K33 data after setting the slave address. Following a

R/W bit (=“0”) and acknowledge bit, the register address (An) is written to the address W pointer.

Next the START condition and slave address are repeated followed by a R/W bit (=“1”). The data

which was addressed is then transmitted. The address pointer is only incremented on reception of

an acknowledge clock. The HT16K33 will place the data at address An+1 on the bus. The master

reads and acknowledges the new byte and the address pointer is incremented to “An+2”.

● If the register address (An) is 0X00h ~ 0X0Fh, after reaching the memory location 0X0Fh, the

pointer will be reset to 0X00h.

● The key data RAM of address 0x40H~0x45H should be read continuously and completed in one

operation, so the key data RAM of address should be started from 0x40H only.

● This cycle of reading consecutive addresses will continue until the master sends a NACK signal

and STOP condition.

Slave Address

ACK

Write

Command / register address b�te

ACK

S 1 1 1 0 A� A1 A0 0

D15 D14 D13 D1� D11 D10 D9 D8

Data b�te

NACK

D7 D� D5 D4 D3 D� D1 D0

n b�tes data

Slave Address

Read

S 1 1 1 0 A� A1 A0 1

ACK

Data b�te

D7 D� D5 D4 D3 D� D1 D0

First b�te data

ACK

Data b�te

D7 D� D5 D4 D3 D� D1 D0

Second b�te data

∫∫

ACK

Reading n Data Bytes from the HT16K33

HT16K33 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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