TDA5150 Datasheet, PDF (24/106 Pages) Infineon Technologies AG – On-chip, high resolution fractional-N synthesizer and Sigma-Delta modulator with ASK, FSK, GFSK options

TDA 5150
TDA 5150 Functional Description
2.4.3.3 Command Byte Structure
First byte of each SPI sequence is the Command Byte, with the following structure:
Function Code
Command Byte Configuration
C1
C0
Address
x
x
A5
A4
A3
A2
A1
A0
The first 2 bits C1, C0 of the Command Byte are the function code field.
They define the command to be performed, according to the following table:
C1
C0
Function Code Configuration Bits
0
0 Write data into SFR register
<A5:A0> field contains the SFR register’s address
There are 2 possible write modes (controlled by state of EN line):
1. write to a single address
2. burst mode write (with address auto increment)
0
1 Read data from SFR, <A5:A0> points to register address
1
0 Reserved (do not use)
1
1 Transmit Command Byte
Bits <A5:A0>within this byte define the transmission parameters
(see Chapter 2.4.3.4 Transmit Command for command fields).
The Write / Read Command bytes are used for device control. Bit fields <A5:A0> within
Command Byte are used to specify the addressed SFR register.An overview and
register map is given in Chapter 2.5.1 SFR Register List.
There are two ways to program the SFR registers:
1. by sending a Write command individually, for each register which should be written.
2. by sending a Burst Write command, which allows sequential programming.
Attention: Writing to address space beyond the valid SFR address range [0x04 -
0x27] is prohibited, and may lead to system malfunction.
Data Sheet
24
V 1.0, July 2009