tda7333 STMicroelectronics, tda7333 Datasheet - Page 11

• Manufacturer Part Number: tda7333
• Description: Rds/rbds Processor
• Manufacturer: STMicroelectronics

7.7 Programming through Serial bus interface
The serial bus interface is used to access the different registers of the chip. It is able to handle both I2C and SPI
transfer protocols, the selection between the two modes is done thanks to the pin CSN :
In both modes, the device is a slave, i.e the clock pin SCL_CLK is only an input for the chip.
Depending on the transfer mode, external pins have alternate functions as following:
Table 7.
Eight registers are available with read or read/write access rights as following :
Table 8.
The meaning of each bit is described below :
– if the pin CSN is high, the interface operates as an I2C bus.
– if the pin CSN is asserted low, the interface operates as a SPI bus.
rds_bd_ctrl[7:0]
rds_corrp[7:0]
rds_bd_h[7:0]
rds_bd_l[7:0]
sinc4reg[7:0]
rds_int[7:0]
rds_qu[7:0]
testreg[7:0]
register
SA_DATAOUT
SDA_DATAIN
SCL_CLK
pin
access rights
read/write
read/write
read/write
read/write
read
read
read
read
DATAOUT (data output)
SPI mode (CSN=0)
DATAIN (data input)
CLK (serial clock)
function in
interrupt source setting,synch., bne information
error correction status, buffer ovf information
sinc4 filter settings (for internal use only)
frequency, quality sensitivity, plls setting
quality counter, actual block name
test modes (for internal use only)
high byte of current RDS block
low byte of current RDS block
function
I2C mode (CSN=1)
SA (slave address)
SCL (serial clock)
SDA (data line)
function in
TDA7333
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