Command Codes

User Defined Character Definition (08h, CODE, Byte1…Byte5)

This command defines a user defined character (UDC). The UDC character code is set by the CODE byte and must be 00H to 07H. All other values for CODE will be ignored by this command. The five bytes following a valid CODE byte define the character. D1 through D40 represent the character dots. A (1) indicates the dot is on and (0) indicates the dot is off in the following format:

5 x 8 Dot Matrix Character

D1	D2	D3	D4	D5
D6	D7	D8	D9	D10
D11	D12	D13	D14	D15
D16	D17	D18	D19	D20
D21	D22	D23	D24	D25
D26	D27	D28	D29	D30
D31	D32	D33	D34	D35
D36	D37	D38	D39	D40

BYTE#	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
1	D1	D2	D3	D4	D5	D6	D7	D8
2	D9	D10	D11	D12	D13	D14	D15	D16
3	D17	D18	D19	D20	D21	D22	D23	D24
4	D25	D26	D27	D28	D29	D30	D31	D32
5	D33	D34	D35	D36	D37	D38	D39	D40

Character Table Select (09h, TABLE CODE)

This command selects which character table to display. The TABLE CODE byte determines the character set as defined in the table below. If bits 0 to 3 are all zero then this command is ignored. When a new character table is selected all characters on the display will be updated to display the character of the new table. After a reset the character table is set to Table 1

Table Code	Character Table
01h	Table 1
02h	Table 2
03h	Table 3
04h	Table 4

Clear Display (12h)

This command sets all 40 characters to 20h (space) and moves the cursor to the first position of the top line.

Luminance Control (11h, LUMINANCE)

This command selects the display luminance. The LUMINANCE byte sets the display luminance level as defined in the table below. This command is ignored if the LUMINANCE byte is 00h.

LUMINANCE	Display Luminance
01h	25%
02h	50%
03h	75%
04h	100%

Cursor Position (10h, POSITION)

This command sets the cursor position. The POSITION byte moves the cursor position according to the table below. The next character byte writes to the new position and the cursor auto-increments to the next position. This command is ignored if the POSITION byte value is greater than 27h.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1	00h	01h	02h	03h	04h	05h	06h	07h	08h	09h	0Ah	0Bh	0Ch	0Dh	0Eh	0Fh	10h	11h	12h	13h
2	14h	15h	16h	17h	18h	19h	1Ah	1Bh	1Ch	1Dh	1Eh	1Fh	20h	21h	22h	23h	24h	25h	26h	27h

Reset (13h)

This command resets the module to the following conditions:

•100% luminance

•All 5x8 dot matrix characters set to 20h (space)

•Cursor position set to 00h

•Character table set to Table 1

•All user defined characters cleared