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M494 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M494
Description  SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH 4 ANALOG CONTROLS AND mP INTERFACE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M494 Datasheet(HTML) 6 Page - STMicroelectronics

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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
6/22


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