SI4708-C Datasheet, PDF (28/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
Register 09h. Boot Configuration
Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Name
Reserved
Type
R/W
Reset value = 0x0000
Bit
Name
Function
15:0
Reserved If written, these bits should be read first and then written with their pre-existing values.
Do not write during powerup.
Register 0Ah. Status RSSI
Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Name RDSR STC SF/BL AFCRL RDSS BLERA[1:0] ST
RSSI[7:0]
Type R R R
R
R
R
R
R
Reset value = 0x0000
Bit
Name
Function
15
RDSR RDS Ready (Si4709 only).
0 = No RDS group ready (default).
1 = New RDS group ready.
Refer to “4.4. RDS/RBDS Processor and Functionality”.
14
STC
Seek/Tune Complete.
0 = Not complete (default).
1 = Complete.
The seek/tune complete flag is set when the seek or tune operation completes. Setting
the SEEK 02h[8] or TUNE 03h[15] bit low will clear STC.
13
SF/BL Seek Fail/Band Limit.
0 = Seek successful.
1 = Seek failure/Band limit reached.
The SF/BL flag is set high when SKMODE 02h[10] = 0 and the seek operation fails to
find a channel qualified as valid according to the seek parameters.
The SF/BL flag is set high when SKMODE 02h[10] = 1 and the upper or lower band limit
has been reached.
The SEEK 02h[8] bit must be set low to clear SF/BL.
12
AFCRL AFC Rail.
0 = AFC not railed.
1 = AFC railed, indicating an invalid channel. Audio output is softmuted when set.
AFCRL is updated after a tune or seek operation completes and indicates a valid or
invalid channel. During normal operation, AFCRL is updated to reflect changing RF envi-
ronments.
28
Rev. 1.2