DOCUMENT
NO.
REV.NO
PAGE
STANDARD
NAME
00
5
Function Descriptions
The
anode and grid data is clocked into the module using a synchronous serial
interface. The refresh rate should be at least 60HZ
(100HZ IS RECOMMANDED). The
sequence
That this data should be sent to the module is as follows:
Clock in the anode data
Clock in the grid data
Latch the anode and grid data
Disable the clear signal
Enable the clear signal
A minimum of 36 anode data bits should be sent to the module.The table below
details the correlation between the anode bits clocked into the
module and their
Pixel position in the 5X7 characters. The 36
TM
bits
is unused in the upper row
of characters and is the inverted triangel in the lower row. Additional bits can
be clocked into the module if necessary. The module will only display the last
36 data bits.if, for example. 5 complete bytes of data are sent.the triangle will
be the last bit of byte 5. and the first 4
bits of byte 1 will not be displayed.
At
any point in time only 1 grid should be active.this active bit can be
propagated through the display by clocking in low GRID DATA bits for the other
position. For example: send the anode data for character position 1.then clock
in a high GRID DATA bit(using the LATCH CLK signal). To display
a
character at
position 2,send the anode data then clck in a
low GRID DATA bit.this can be continued
to character position 40. The table below details the character
position of the
VFD.
1ST
2ND
19TH
20TH
21ST
22ND
39TH
40TH
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