Rev. 1.10

21

July 01, 2011

HT16K23

Read Operation

● In this mode, the master reads the HT16K23 data after setting the slave address. Following a R/W bit (=“0”)

and an acknowledge bit, the register address (An) is written to the address pointer. Next a START condition and

a 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 HT16K23 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 reset to 0X00H. If the register address (An) is 0X20H ~ 0X22H, after reaching the

memory location 0X22H, the pointer will reset to 0X20H.

● This cycle of reading consecutive addresses will continue until the master sends a STOP condition.

1 1 1 0 0 1 1 1

S

SLAVE ADDRESS

READ

DATA(n)

ACK

ACK

ACK

DATA(n+1)

ACK

DATA(n+x)

P

1 1 1 0 0 1 1 0

S

ACK

SLAVE ADDRESS

WRITE

REGISTER

ADDRESS(An)

P

ACK

NACK