Matrix-orbital LCD0821 Manual do Utilizador descarregar pdf (Página 18)

6.3 Special Characters

3.1 Create a Custom

Character

Dec

Hex

ASCII

254 78

FE 4E

■ N

ID Data

v5.0

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.

Byte

Character ID, value between 0 and 7.

Data

Byte[8]

Character pixel data as shown below.

Table 9: Custom Degree Character

Data[1]

000

00001000

Data[2]

000

00010100

Data[3]

000

00001000

Data[4]

000

00000011

Data[5]

000

00000100

Data[6]

000

00000100

Data[7]

000

00000011

Data[8]

000

00000000

3.2 Save Custom

Characters

Dec

Hex

ASCII

254 193

FE C1

■ ñ

Bank ID Data

v5.0

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.

Byte

1 byte, value between 0 and 7.

Data

Byte[8]

8 bytes, character pixel data as above.

Table 10: Custom Character Banks

Start-up Characters

Horizontal Bars

Vertical Bars

Medium Digits

Large Digits

3.3 Load Custom

Characters

Dec

Hex

ASCII

254 192

FE C0

■ └

Bank

v5.0

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.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 30 31

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