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PDF MOP-AV204A Data sheet ( Hoja de datos )
| Número de pieza | MOP-AV204A | |
| Descripción | Parallel Display | |
| Fabricantes | Matrix Orbital | |
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MOP-AV204A
Parallel Display Specifications
Revision 1.0
1 page  
Instructions
Outline
The MOP line is controlled using a standard HD44780 compliant controller. The display is enabled by
pulling the Chip Enable (E) pin high, communication to and from the device is controlled using the
Read/Write (R/W) input, and one of two available 8-bit registers are selected via the Register Select (RS)
line. Using Register Select, either the Instruction Register (IR) or Data Register (DR) is selected by
toggling RS low or high respectively.
While executing from the IR, the display will pull the Most Significant Bit of the data bus, DB7, high.
While this Busy Flag (BF) is set, any instructions sent to the unit will be ignored. The status of this flag
and the current position of the Address Counter (AC) can be obtained by performing a read operation on
the instruction register at any time.
Table 3: Register Selection
RS R/W
Operation
00
IR write as an internal operation (display clear, etc.)
01
Read busy flag (DB7) and address counter (DB0 to DB6)
1 0 Write data to DDRAM or CGRAM (DR to DDRAM or CGRAM)
1 1 Read data from DDRAM or CGRAM (DDRAM or CGRAM to DR)
When writing for the DR, one of two locations can be chosen using the AC. The value provided to the AC
when executing a set address command differentiates these locations. The AC is automatically
decremented or incremented after a read or a write.
DDRAM provides eighty bytes of display memory to all displays. Memory outside the bounds of the
display area can be used as general RAM. DDRAM addressing begins at the top left of the display with a
value of 0, addresses then increment from left to right then down once a row is filled.
Table 4: Two Line Addressing
Position 1 2 ... 40
DDRAM 00 01 ... 27
Address 40 41 ... 67
Table 5: Four Line Addressing
Position 1 2 ... 20
00 01 ... 13
DDRAM 40 41 ... 53
Address 14 15 ... 27
54 55 ... 67
CGRAM provides eight custom characters that can be created by writing to CGRAM locations then
displayed using the first eight CGROM character codes, as seen in the character ROM table below.
Characters are sent to the display by performing a write operation on the DR using the correct character
address within CGROM. Instructions are issued by writing to the IR; a complete list is available below.
4
5 Page 
Test Mode
Test mode is initiated by connecting 2 and 3 pin of the 3pin connector CN2 before applying power. In
the test mode, a checker pattern is displayed across all characters of the screen. Please note that CN2
may be removed in the future.
Precautions
Operation outside absolute maximum ratings may cause permanent damage.
Ensure Anti-Static handling procedures are followed. Store in an anti-static container within a
clean environment.
Do not make extra holes on the display, modify its shape, or change the components. Do not
drop, bend, twist, or disassemble the display.
Physical shock greater than 100G, thermal shock in excess of 10°C/minute, or a direct hit to the
glass display surface may crack the glass.
Do not PUSH the display strongly. At mounting to the system frame, slight gap between display
glass face and front panel is necessary to avoid a contact failure of lead pins of display. Twist or
warp mounting will make a glass CRACK around the lead pin of display.
Neither data nor power connectors should be connected or disconnected while power is
applied. Removal of primary power with logic signals applied may damage input circuitry.
Power must be regulated completely since all control logic depends on this line. Do not apply
slow-start power. Provide sufficient power to supply inrush current at startup.
Data cable length between module and host system is recommended within 300 mm to be free
from a miss-operation caused by noise.
Running in test mode for 2 hours may help the stability of the brightness of them VFD when
power has not applied more than 2 months.
Displaying a fixed (static) message longer than 5 hours in a day may cause the phosphor to burn-
out. An automatic shut down in programming, scrolling message, or test mode operation during
idling of the host is recommended.
10
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MOP-AV204A.PDF ] | |
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