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17
7.3
Special Characters
3.1
Create a Custom
Character
Dec
Hex
ASCII
254 78
FE 4E
■
N
ID Data
ID Data
ID Data
v5.1
Creates a custom character. Each character is divided into 8 rows of 5 pixels; each data byte represents one row.
Each byte is padded by three zero bits followed by five bits representing each pixel state. A one represents an on
condition while a zero is off. Characters are lost when a new memory bank is loaded, unless they are saved.
ID
Byte
Character ID, value between 0 and 7.
Data
Byte[8]
Character pixel data as shown below.
Table 12: Custom Degree Character
Data[1]
000
p1
p2
p3
p4
p5
00001000
8
Data[2]
000
p1
p2
p3
p4
p5
00010100
20
Data[3]
000
p1
p2
p3
p4
p5
00001000
8
Data[4]
000
p1
p2
p3
p4
p5
00000011
3
Data[5]
000
p1
p2
p3
p4
p5
00000100
4
Data[6]
000
p1
p2
p3
p4
p5
00000100
4
Data[7]
000
p1
p2
p3
p4
p5
00000011
3
Data[8]
000
p1
p2
p3
p4
p5
00000000
0
3.2
Save
Custom
Characters
Dec
Hex
ASCII
254 193
FE C1
■
?
Bank ID Data
Bank ID Data
Bank ID Data
v5.1
Provides access to all memory banks to create and save custom characters, graph bars, and large digits. Any new
characters saved will overwrite the old, so care should be taken when writing to any bar or digit memory bank.
Bank structure is shown below.
Bank
Byte
1 byte, memory bank ID, value between 0 and 4, as below.
ID
Byte
1 byte, value between0 and 7.
Data
Byte[8]
8 bytes, character pixel data as above.
Table 13: Custom Character Banks
0
Start-up Characters
1
Horizontal Bars
2
Vertical Bars
3
Medium Digits
4
Large Digits
3.3
Load Custom
Characters
Dec
Hex
ASCII
254 192
FE C0
■
└
Bank
Bank
Bank
v5.1
Loads a bank of custom characters into memory for use. Must be issued before using a bank of characters.
Alternatively, an appropriate initialize command can be used.
Bank
Byte
Memory bank ID, value between 0 and 4, as above.
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