ePVP6800
VFD Controller
KEY1….KEY4
SEG1/KS1
KEY1….KEY4
SEG2/KS2
SEG3/KS3
SEG4/KS4
b0 -- -- b3
b4 -- -- b7
When the most significant bit of data (SEG4, b7) has been read, the least significant bit of the next
data (SEG1, b0) is read.
8.1 Commands
A command sets the display mode and status of the VFD driver.
The first 1 byte (b0 to b7) inputted to the ePVP6800 through the DIN pin after the STB pin has fallen,
is regarded as a command. Interrupt event will occur when STB pin is falling.
If STB mode is high while a command/data are being transmitted, serial communication is initialized,
and the command/data being transmitted is invalidated (however, the command/data already
transmitted remain valid).
8.1.1 Display Mode Setting Command [00]
This command initializes the ePVP6800 and selects Display mode number of segments and grids (1/4
to 1/11-duty, 6 segments to 8 segments) as illustrated below.
When Display Mode command is executed, display is forcibly turned off, and key scanning is also
stopped. To resume display, a display ON command must be executed. If the same Display mode is
selected, nothing is performed.
When power is turned “ON,” default Display mode is “9-digit, 8-segment.”
MSB
b7 b6 b5 b4 b3 b2 b1 b0 LSB
0
0
0
0
0
1
1
1
Initial value
Display mode
Not Relevant
000 : 4 digits, 8 segments.
001 : 5 digits, 8 segments.
010 : 6 digits, 8 segments.
011 : 7 digits, 8 segments.
100 : 8 digits, 8 segments.
101 : 9 digits, 8 segments.
110 : 10 digits, 7 segments.
111 : 11 digits, 6 segments.
Default setting
Fig. 8 Display Mode Setting Command Selection
32 of 47 11. 28.2004 (V1.23)
This specification is subject to change without further notice.
ELAN [ ELAN MICROELECTRONICS CORP ]
