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LCD Controller Specification
B.5
CHARACTER COMMANDS
The character commands treat the display like a 20-column, 4-row character display
where the characters occupy 6 x 8 pixel elements. Note that there are 20 character
locations on a row, each 6 pixels wide. This current implementation only uses 120
pixels of the 122-pixel wide display. The spare two-pixel columns are on the right of the
display and cannot be affected by the character commands. The controller has a fixed
space 5 x 7 font set for the printable ASCII characters in range: 0x20 -> 0x7E. The
controller also recognizes three special characters that do not affect the display.
Note:
The ChrPos increment after writing is suppressed for the special
characters.
1. CR: (0x0D) Increments ChrPosR.
2. LF: (0x0A) Sets ChrPosC = 0 and increments ChrPosR.
3. BS: (0x08) Decrements ChrPosC if ChrPosC > 0; it is non-destructive
B.5.1
ChrPos Command
The ChrPos command sets the character position to ChrPosC, ChrPosR. This
command has no effect on the display except for moving character cursor if it is turned
on.
Field
Opcode
Form
0xC5
Value
ChrPosC
ChrPosR
0
0
0
0
0
0
C4
0
C3
0
C2
0
C1
R1
C0
R2
Column 0-19
Row 0-3
B.5.2
ChrPosInc Command
The ChrPosInc command increments the character position. This command has no
effect on the display except for moving the character cursor if it is turned on.
Field
Opcode
Data
B.5.3
None
WrtChr Command
Form
Value
0x8E
None
The WrtChr command sets ChrPos to (ChrPosC,ChrPosR), then writes ASCII
character to ChrPos.
Field
Opcode
Form
0xE6
Value
Data
ChrPosC
ChrPosR
0
0
0
A6
0
0
A5
0
0
A4
C4
0
A3
C3
0
A2
C2
0
A1
C1
R1
A0
C0
R0
ASCII character
Column 0-19
Row 0-3
B.5.4
WrtChrInc Command
The WrtChrInc command sets ChrPos to (ChrPosC,ChrPosR), writes an ASCII
character to ChrPos, and then increments ChrPos.
Field
Opcode
Form
0xE7
Value
Data
ChrPosC
ChrPosR
0
0
0
A6
0
0
A5
0
0
A4
C4
0
A3
C3
0
A2
C2
0
A1
C1
R1
A0
C0
R0
ASCII character
Column 0-19
Row 0-3
? 2003 Microchip Technology Inc.
Advance Information
DS70099B-page 59
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