FUNCTIONAL DESCRIPTION (continued)

Table 1 : Remote Control Commands (address 10, code = 1010)

Command

Number

Function

Code

16 Programs

20 Programs

C1

C2

C3

C4

C5

C6

0

1

2

3

4

5

6

EOT

Standby

Mute (toggle)

Program 1

Program 2

Program 3

Program 4

EOT

Standby

Mute (toggle)

Program 1

Program 2

Program 3

Program 4

0

1

1

0

1

0

1

0

0

1

0

0

1

1

0

0

0

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

7

8

9

10

11

12

Contrast up

Contrast down

Program 5

Program 6

Program 7

Program 8

Contrast up

Contrast down

Program 5

Program 6

Program 7

Program 8

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

13

14

15

16

17

18

Memory Seq. up

Memory Seq. down

Program 9

Program 10

Program 11

Program 12

Memory Seq. up

Memory Seq. down

Program 9

Program 0

– 10 (decade)

+ 10 (decade)

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

19

20

21

22

23

24

Normalise

On/stby (tog.)

Program 13

Program 14

Program 15

Program 16

Normalise

On/stby (tog.)

1*

NOP

NOP

NOP

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

25

26

27

29

28

30

Volume up

Volume down

Brightness up

Brightness down

Saturation up

Saturation down

Volume up

Volume down

Brightness up

Brightness down

Saturation up

Saturation down

1

1

0

0

1

1

0

1

0

1

0

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

The above table showns the difference between the 16 and 20 program options with respect to the remote control commands. Commands 16,

17, 18 &21 change function between the two options. Commands 22, 23 & 24 should not be used in the 20 program option, as they have no

function.

NOP = No operation

Program Memory

NV memory (EEPROM) is integrated on the chip to

provide storage for up to 20 stations.

Each memory location is 17 bits in length providing

12 bits for tuning voltage, 2 bits for band, 2 bits for

two coded multi-standard outputs and 1 bit pro-

gram skip flag.

Individual program words can be read on command

from the keyboard, remote or data command

sources but can only be written on command from

the keyboard.

There are two methods for storing a program (writ-

ing the memory) : pre and post tuning selection of

the program number. See Commands, section 7.

Reading each memory location in sequence (up or

down) can also be achieved from all the command

sources.

All memory timing functions are provided on chip

and only one external transistor is required to

switch the external memory supply (25V).

There are essentially two operations carried out on

the memory : Write/Modify and Read.

The Write/Modify cycle consists of 3 steps :

a) All ”1s” are written to the bits of the addressed

word.

b) All bits of the word are erased.

c) The new contents are written.

Using this method all the bits of the addressed word

are aged the same. For more detail concerning the

write, erase and read current waveforms at the

Memory Supply pin see M491 datasheet.

Memory For Analog Controls

The memory for the analog controls is electrically

identical to the main program memory but is organ-

ised as four 6-bit words located in two sequentially

addressed words at the memory. Each word cor-

responds to the Volume, Brightness, Saturation

and Contrast outputs. At power on reset and nor-

malise command each memory word is read out to

its corresponding counter and D/A in sequence.

M494

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