AN332
200
Confidential Rev. 0.2
Table 46 provides an example of programming for the FM/RDS Transmitter. The table is broken into three columns.
The first column lists the action taking place: command (CMD), argument (ARG), status (STATUS) or response
(RESP). For SET_PROPERTY commands, the property (PROP) and property data (PROPD) are indicated. The
second column lists the data byte or bytes in hexadecimal that are being sent or received. An arrow preceding the
data indicates data being sent from the device to the system controller. The third column describes the action.
Note that in some cases the default properties may be acceptable and no modification is necessary. Refer to
Section "5. Commands and Properties" on page 6 for a full description of each command and property.
Change Chip
Function
To FM Receive?
(Si472x only)
Send POWER_DOWN
(command 0x11)
Yes
CHIP STATE:
POWER DOWN
Send POWER_UP
For FM Receive
(command 0x01)
CHIP STATE:
POWER UP (FM Receive)
Look at FM Receive
Flowchart
No
TRANSMISSION
DONE?
Yes
Send POWER_DOWN
(command 0x11)
CHIP STATE:
POWER DOWN
Repeat any of the
instructions above after
POWER_UP state
To change settings
No
Go back to the very first
POWER DOWN state to
POWER UP the chip in FM
Transmit
Need to change
DCLK/DFS
Rate?
(digital only)
Disable digital audio by
setting DFS sample rate to 0
(property 0x0103)
Enable digital audio by
setting DFS sample rate
(property 0x0103)
Yes
No
Change DCLK/DFS rate or
Disable DCLK/DFS
DCLK/DFS has been
changed or re-enabled
Содержание Si4700
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