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SVID Single-Chip Video Controller
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MVS Corporation s single-chip serial video controller (SVID) is a very interesting, low-cost way to display information and or graphics using a small microprocessor such as the STAMP or a PIC. The SVID video controllers feature low power consumption and no external memory chips, since the internal SRAM and EEPROM are used for display memory. High-speed serial and parallel interfaces are built in. Since the internal memory is nonvolatile and the SVID operates with or without a micro, it s perfect for stand-alone displays. Applications include smart home systems, factory status panels, lab instrument readouts, vu-meters, portable sales terminals, etc. The NTSC version will drive a TV VCR, or any other , composite display. The new 4- to 6-in composite-type LCD panels are compact, low power, and inexpensive. CRT and LCD monitors (15, 17, 21 in, etc.) can be driven by the VGA version. The diagram in Fig. 3-7 illustrates the VGA/CRT version of the SVID controller, while Fig. 3-8 depicts the NTSC video controller pinouts (http://star.net/people/nmvs) In the character generator (CG) mode, 48 digits (8 6) are displayed from RAM with sixteen 5 7-character font tables held in EE. Graphics mode has 32 22 pixels total with 32 6 bit-mapped from RAM and the rest (32 16) from EE. Both RAM and EEPROM (electrically erasable read-only memory) memory can be updated by the user via the serial/parallel interface. The SVID is intended for low-resolution applications and educational use in the area of embedded controllers. For high-resolution applications, there s the MVSVGA2, a 640 480 VGA controller that drives color LCD and CRT VGA monitors. Minimum components needed for all the video controllers are a 16-MHz crystal wired between pins 4 and 5 with two 47-pF caps to ground. A 5-Vdc supply or three alkaline cells
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SVID SINGLE-CHIP VIDEO CONTROLLER 45
47pF
1 2 3 4 5 6 7 8 9 10
VCC PDAT6 PDAT5
20 19
SDAT SCLK
47pF
SBSY Serial input pins
18 17 PDAT4 16 PDAT3 15 PDAT2 14 PDAT1 13 PDAT0 12 11
Video
Horz.
VGA/CRT
Vert. Figure 3-7 Single-chip serial video controller (SVID) VGA/CRT version. +5V +5V
1 2 3 4 5 6 7 8 9 10 OSC1 OSC2
VCC PDAT6 PDAT5
20 19
SDAT Serial input pins SCLK
SBSY
18 17 PDAT4 16 PDAT3 15 PDAT2 14 PDAT1 13 PDAT0 12 11
NTSC 560 100 1.2K Figure 3-8 Single-chip serial video controller (SVID) NTSC version.
NTSC
Video output
46 SERIAL BUILDING BLOCKS
are typical sources of power. When powered from batteries, the chip draws virtually no current when off, yet internal RAM retains data. The chip can be powered down by grounding the OFFL pin and powered up again by momentarily grounding ONL. (Note: if you are using pin 1, put a 0.01- F capacitor to GND.) CRT and LCD monitors are driven directly from the VGA version as follows: generating composite from the NTSC version requires three resistors 100 with one end on ground and the other end to 1.2 k and 560 . The 560- resistor goes to pin 8; the 1.2-k resistor goes to pin 9. The signal is across 100 . There are four versions of the serial video controller: SVID-cn Character generator, NTSC out (TV VCR, composite LCD) , SVID-cv Character generator, VGA out (15-kHz CRT or LCD monitor) SVID-gn Graphic mode, NTSC out SVID-gv Graphic mode, VGA out
SN7516 Differential Bus Transceiver
The Texas Instruments SN7516 differential bus transceiver can be readily used to form a bidirectional RS-485 network when combined with the BASIC STAMP 2. The RS-485 serial protocol is commonly used to provide strong serial signals able to withstand long cable distances (up to 4000 ft) at high baud rates in potentially noisy electrical environments. Two wires carrying an RS-485 signal (the A and B lines) provide a signal base from which many devices can communicate. Twisted-pair wire is recommended for long distances, but for short distances 24-gauge wire works quite well. Up to 32 devices can be connected to an RS-485 data line with the SN75176 and communicate using a data protocol. This is referred to as an RS-485 network, or an RS-485 drop network. The SN7516 chip converts RS-485 signals to RS-232 TTL-level signals, allowing devices that traditionally communicate over standard RS-232 serial connections to communicate over a single 2wire RS-485 network. The SN7516 bus transceiver is an 8-pin in-line DIP chip that runs on 5 Vdc. A typical connection is illustrated in Fig. 3-9.
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