7initialize large digits (254 110), 8place large digit 254 35 [col] [digit – Matrix Orbital LK204-25 Legacy User Manual
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Custom characters occupy a 5 x 8 pixel matrix. Built-in characters are 5 x 7: the bottom row of pixels is
normally reserved for the underline cursor. The underline cursor should be turned off if the bottom row of
pixels forms part of a custom character.
The characters are defined by issuing the command 254 78 [c] followed by 8 bytes to define the character.
[c] is the character number (0x00 to 0x07). The 8 bytes are mapped as shown below:
MSB
LSB
*
*
*
1
2
3
4
5
Data Byte 1
*
*
*
6
7
8
9
10
Data Byte 2
*
*
*
11 12 13
14
15
Data Byte 3
*
*
*
16 17 18
19
20
Data Byte 4
*
*
*
21 22 23
24
25
Data Byte 5
*
*
*
26 27 28
29
30
Data Byte 6
*
*
*
31 32 33
34
35
Data Byte 7
*
*
*
36 37 38
39
40
Data Byte 8
A "1" bit indicates an on (black) pixel, a "0" bit indicates an off (clear) pixel.
Once defined, a character is displayed simply by issuing a value (0x00 to 0x07) corresponding to the
character number. The character will be laid out as follows:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Cursor Line
Note: Custom characters will be erased if any of the "initialize bar graph" commands are issued.
5.1.7Initialize large digits (254 110)
This command defines the 8 special/user characters to be blocks suitable for use in drawing large digits.
Any previously existing definitions will be lost. Once this command has been issued, any number of large
characters may be placed until the characters are redefined by another command.
5.1.8Place large digit 254 35 [col] [digit]
This command allows the large digits to be drawn on the LCD screen. Numbers of almost full display
height may be placed along side regular text on four row displays. The column number has a maximum
value which is less than the display width because the digits are all three columns wide.
LK204-25 rev 1
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