TDA7529 datasheet(31/60 Pages) STMICROELECTRONICS

31 / 60 page

TDA7529

Tuning state machine

31/60

5.1.5

Mode 100: jump

Figure 11.

Jump timing diagram

This mode is used to jump to a different frequency and stay there, with reception at the end

of the sequence.

AFHOLD can be used to tell the back-end to mute/unmute the audio and keep normal

processing on hold.

AFSAMPLE can be used to tell the back-end when the quality signal processing can be

restarted, with a stable situation to start from.

5.2

Mode 100: check

Figure 12.

Check timing diagram

This mode is used to jump to a different frequency and stay there, with audio muted.

AFHOLD can be used to tell the back-end to mute/unmute the audio and keep normal

processing on hold.

AFSAMPLE can be used to tell the back-end when to freeze the quality signal processing.

EVENTS

TIME

transmission with subaddr. bit 7 = 1

wait T1ms

wait for Tplllock

wait T0.5ms

wait 50 us

AFSAMPLE

AFHOLD

B.E. OPERATION

mute audio

hold

unmute audio

bus

STOP

event

regs

swap

AC00048

EVENTS

TIME

transmission with subaddr. bit 7 = 1

wait T1ms

wait for Tplllock

AFSAMPLE

AFHOLD

B.E. OPERATION

mute audio

hold

bus

STOP

event

regs

swap

AC00049

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