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8.2 Read transfer

Eight bytes can be read at a time (please refer to the to the pages ??? to ??? for the meaning of each bit).

The master has always the possibility to read less than eight registers by not sending the acknowledge bit

and then generating a stop condition after having read the needed amount of registers.

There are two typical read access :

– read only the first register rds_int to check the interrupt bit.

– read the first five registers rds_int, rds_qu, rds_corrp, rds_bd_h, rds_bd_l to get the RDS data

The registers are read in the following order : rds_int, rds_qu, rds_corrp, rds_bd_h,rds_bd_l, rds_bd_ctrl,

sinc4reg, testreg.

R

S

S lave addre ss

rd s_ in t

A

rd s_qu

A

A

te stre g

A

P

from master to slave

from slave to master

S = start condition

Slave address = 001000S ( where S is the level of the pin

SA_DATAOUT)

A = acknowledge bit

P = stop condition

R = read mode

S

SDA

SCL

START

CONDITION

RACK

rds_int[7:0]

rds_qu[7:0]

ACK

ACK

SA

0

SLAVE ADDRESS

rds_corrp[7:0]

rds_bd_h[7:0]

rds_bd_l[7:0]

P

STOP

CONDITION

ACK

ACK

ACK

S

SDA

SCL

START

CONDITION

RACK

rds_int[7:0]

SA

0

SLAVE ADDRESS

P

STOP

CONDITION

ACK