Figure 9

M491B

R

C

TDA2320

or TDA8160

Supply Voltage of

TDA2320

R

C

5

12

2.2k

Ω

10k

Ω

4.7nF

4.7nF

M491B REMOTE CONTROL RECEIVER TRUTH TABLE. Transmitter M708 ; Address Code 9

Command

Number

I.R. Code

Function

C1

C2

C3

C4

C5

C6

0

0

0

0

0

0

0

End to Transmission

1

2

3

4

5

6

1

1

0

1

0

1

0

1

0

0

1

1

0

0

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Power On/Off

Mute On/Off

Memory 1

Memory 2

Memory 3

Memory 4

7

8

9

10

11

12

1

1

0

1

0

1

0

1

0

0

1

1

0

0

1

1

1

1

0

0

0

0

0

0

1

1

1

1

1

1

0

0

0

0

0

0

Fine Detuning Up

Fine Detuning Down

Memory 5

Memory 6

Memory 7

Memory 8

13

14

15

16

17

18

1

1

0

1

0

1

0

1

0

0

1

1

0

0

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

Memory Up

Memory Down

Memory 9

Memory 10

Memory 11

Memory 12

19

20

21

22

23

24

1

1

0

1

0

1

0

1

0

0

1

1

0

0

1

1

1

1

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

Manual Search Up

Manual Search Down

Memory 13

Memory 14

Memory 15

Memory 16

25

26

27

28

29

30

1

1

0

1

0

1

0

1

0

0

1

1

0

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Volume Up

Volume Down

Memory Addressing

Digital AFT On

Band Sequential

Automatic Search

- check of the position of the received bits opening

window at the time bases

- check of the parity bit

- check of the absenceof pulses between the parity

bit and the stop pulse

- check of noise level ; the receiver checks parasitic

transients inside and outside the time windows.

If the above test conditions are not fulfilled, the

received word is rejected and not decoded. If the

received signal is acknowledged as a valid word it

is stored an decoded.

The end of transmission will be acknowledged by

receiving the end of transmission code or by means

of an internal timer if the transmission remains

interrupted for more than about 550ms.

PINS 12 & 13 : AFT1-AFT2 (STOP/AFT INPUTS)

These pins are enabled during the automatic

search and during normal operation, when the

digital AFT is enabled (see description of Pin 17).

The STOP/AFT inputs are also disabled internally

during any program or band change for the duration

of the Mute signal.

M491B

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