Silicon Laboratories Si4704 Series Programming Manual page 90

AN332
Property 0x1207. FM_RSQ_BLEND_THRESHOLD
Sets the blend threshold for blend interrupt when boundary is crossed. The CTS bit (and optional interrupt) is set
when it is safe to send the next command. This property may only be set or read when in powerup mode. The
default is 1%.
Default: 0x0081
Units: %
Step: 1
Range: 0–100
Bit D15 D14 D13
Name 0 0
Bit Name
15:8 Reserved
7 PILOT
6:0 BLEND
Property 0x1300. FM_SOFT_MUTE_RATE (Not applicable for Si4749)
Sets the attack and decay rates when entering and leaving soft mute. Higher values increase rates, and lower
values decrease rates. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This
property may only be set or read when in powerup mode. The default is 64.
Default: 64
Step: 1
Range: 1—255
Bit D15 D14 D13 D12 D11 D10
Name 0 0
90
D12 D11 D10
0 0 0 0
Always write to 0.
Pilot Indicator.
This bit has to be set to 1 (there has to be a pilot present) in order for
FM_RSQ_BLEND_THRESHOLD to trigger an interrupt. Without a pilot tone, the part is
always in full mono mode and never goes into blend.
FM RSQ Blend Threshold.
This is a boundary cross threshold. If the blend cross from above to below, or the other
way around from below to above this threshold, it will trigger an interrupt. Specified in
units of % in 1% steps (0–100). Default is 1%.
0 0 0 0
Confidential Rev. 0.2
D9 D8 D7 D6
0 0 PILOT
Function
D9 D8 D7 D6
0 0
D5 D4 D3 D2
BLEND[6:0]
D5 D4 D3 D2
SMRATE[7:0]
D1 D0
D1 D0