TDA7529_11 Datasheet, PDF (32/61 Pages) STMicroelectronics – RF front-end for AM/FM DSP car-radio with IF sampling

Tuning state machine
TDA7529
5.3
Mode 110: load
Figure 13. Load timing diagram
%6%.43
BUS
34/0
EVENT
4)-%
TRANSMISSIONWITHSUBADDRBIT
REGS
SWAP
'!0'03
The content of the buffer and control registers is swapped. No transition occurs on the
AFHOLD and AFSAMPLE lines.
5.4
Mode 111: end
Figure 14. End timing diagram
%6%.43
BUS
34/0
EVENT
4)-%
!&3!-0,%
TRANSMISSIONWITHSUBADDRBIT WAITUS
!&(/,$
"%/0%2!4)/.
UNMUTEAUDIO
'!0'03
This mode is used to end sequences that terminate with muted audio, after the decision on
whether to stay to that frequency or jump to a different one has been taken.
AFHOLD can be used to tell the back-end to unmute the audio.
AFSAMPLE can be used to tell the back-end to restore normal quality signal processing.
Most of the wait times of the algorithm can actually be programmed.
The following table summarizes the minimum, maximum and default values of the
programmable wait times. The indicated values are valid only for the advised configuration
where the phase detector reference frequency is 100 kHz.
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Doc ID 13311 Rev 4