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M494 Datasheet(PDF) 11 Page - STMicroelectronics |
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M494 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 22 page FUNCTIONAL DESCRIPTION (continued) Data Input Shown below are the codes for the commands : see Table 2. The Data input will accept signals whose timing is defined in Figure 6 and electrical characteristics defined in the table of static electrical charac- teristics. The EOT code must be transmitted after each command after a min. period of 112ms. Band Outputs Four band outputs are provided for selection of the signal band : VHF I & III, UHF and CATV. Band skip logic is implemented so that by tieing the relevant pin to VSS a band can be skipped in regions of no transmission in that band. The bands can be se- lected only in a rolling sequence by the band se- quence keyboard command. The sequence is as follows : VHF III, UHF, VHF I, CATV. Multi Standard Outputs Two coded multi standard outputs (or general pur- pose TV system flags) are provided so that the TV set can be designed for use in areas of more than one transmission standard. This function requires an external decoder to realise 4 different standards e.g. PAL 1, PAL 2, NTSC, SECAM etc. The multi standard sequence command available from the keyboard gives a simple binary count at the two outputs : 00, 01, 10, 11, 00 etc. In Standby and Off states the multistandard outputs are pulled to logic LO. Table 2 : Data Commands Command Number Function Code 16 Programs 20 Programs D0 D1 D2 D3 D4 0 1 2 3 4 5 6 EOT Program 1 Program 2 Program 3 Program 4 Program 5 Program 6 EOT Program 1 Program 2 Program 3 Program 4 Program 5 Program 6 0 1 1 1 0 1 0 0 0 0 1 0 0 1 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 8 9 10 11 12 Program 7 Program 8 Program 9 Program 10 Program 11 Program 12 Program 7 Program 8 Program 9 Program 0 – 10 (decade) + 10 (decade) 1 0 1 0 1 0 1 0 0 1 1 0 1 0 0 0 0 1 0 1 1 1 1 1 0 0 0 0 0 0 13 14 15 16 17 18 Program 13 Program 14 Program 15 Program 16 Normalise Volume up 1* NOP NOP NOP Normalise Volume up 1 0 1 0 1 0 0 1 1 0 0 1 1 1 1 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 19 20 21 22 23 24 Volume down Contrast up Contrast down Brightness up Brightness down Saturation up Volume down Contrast up Contrast down Brightness up Brightness down Saturation up 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 25 26 27 28 29 30 Saturation down Memory Seq. up. Memory Seq. down On/standby (toggle) Standby Mute (toggle) Saturation down Memory Seq. up. Memory Seq. down On/standby (toggle) Standby Mute (toggle) 1 0 1 0 1 0 0 1 1 0 0 1 0 0 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 NO TRANSMISSION (pulled up) 1 1 1 1 The above table shown the difference between the 16 and 20 program options with respect to the Data input commands. Commands 10, 11, 12 & 13 change function between the two options. Commands 14, 15 & 16 should not be used in the 20 program option, as they have no function. NOP = No operation. M494 11/22 |
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