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66 lines
4.1 KiB
66 lines
4.1 KiB
6 years ago
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Transcript from http://developer.pertelian.com/index.php?option=com_content&view=section&id=3&Itemid=9
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Received via http://web.archive.org/web/20100903020330/http://developer.pertelian.com/index.php?option=com_content&view=section&id=3&Itemid=9 Apr 2019
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## Pertelian X2040 Hardware Instruction Set
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To issue an instruction, you must first issue a Set Instruction Mode command to set the LCD in instruction mode. The Set Instruction Mode command has byte code 0xFE hex (254 decimal).
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| Instruction | Byte 7 | Byte 6 | Byte 5 | Byte 4 | Byte 3 | Byte 2 | Byte 1 | Byte 0 | Description | Exec. Time |
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| ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- |
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| Set Instruction Mode | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | Sets the LCD to Instruction Mode | 1.64ms |
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The byte following the Set Instruction Mode command is treated as an instruction. For example, to clear the display write the byte codes 0xFE and 0x01 to the device.
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| Instruction | Byte 7 | Byte 6 | Byte 5 | Byte 4 | Byte 3 | Byte 2 | Byte 1 | Byte 0 | Description | Exec. Time |
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| ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- | ---------- |
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| Clear display | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | Clears display and returns cursor to the home position (address 0) | 1.64ms |
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| Backlight Off | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | Turns the backlight off | 1.64ms |
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| Backlight On | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | Turns the backlight on | 1.64ms |
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| Entry mode set | 0 | 0 | 0 | 0 | 0 | 1 | I/D | S | Sets cursor move direction (I/D), specifies to shift the display (S). These operations are performed during data read/write | 40us |
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| Display On/Off control | 0 | 0 | 0 | 0 | 1 | D | C | B | Sets On/Off of all display (D), cursor On/Off (C) and blink of cursor position character (B) | 40us |
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| Cursor/display shift | 0 | 0 | 0 | 1 | S/C | R/L | * | * | Sets cursor-move or display-shift (S/C), shift direction (R/L). DDRAM contents remains unchanged | 40uS |
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| Function set | 0 | 0 | 1 | DL | N | F | * | * | Sets interface data length (DL), number of display line (N) and character font(F) | 40uS |
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| Set CGRAM address <td> 0 <td> 1 <td colspan=6> CGRAM address <td> Sets the CGRAM address. CGRAM data is sent and received after this setting <td> 40uS </td></tr>
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| Set Display Data address <td> 1 <td colspan=7> The offset value: Row 1, Column 1 starts at offset 0x0 hex, Row 2, Column 1 starts at offset 0x40 hex, Row 3, Column 1 starts at offset 0x14 hex, Row 4, Column 1 starts at offset 0x54 hex <td> Set the address where to start displaying characters at using offset to specify row and column <td> 40uS </td></tr>
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| Write to CGRAM or DDRAM <td colspan=8> Data <td> Writes data to CGRAM or DDRAM. For DDRAM see character set below <td> 40uS </td></tr>
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#### Remarks
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- DDRAM = Display Data RAM
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- CGRAM = Character Generator RAM
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- DDRAM address corresponds to cursor position
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- * = Don't care
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DL set 1 for 8 bit interface, 0 for 4 bit interface
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N set 1 for 2 lines, 0 for 1 line
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F set 0 for 5x8 dots
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S/C set 1 for Display shift, 0 for Cursor move
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R/L set 1 for Shift to the right, 0 for Shift to the left
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D set 1 for Display ON, 0 for Display OFF
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C set 1 for Cursor ON, 0 for Cursor OFF
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B set 1 for Cursor blinking
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I/D set 1 for Increment, 0 for Decrement
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S set 1 for Automatic display shift
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## LCD Character Set
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Use the following character codes to display the following symbols from the table. For example, the character 'A' is 01000001 binary or 65 decimal.
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## Initialization Sequence
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Based on the instruction set, the proper Pertelian initialization sequence is as follows:
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0xFE; //Set instruction mode
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0x38; //Function set with 8-bit data length, 2 lines, and 5x7 dot size
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0xFE;
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0x06; //Entry mode set; increment cursor direction; do not automatically shift
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0xFE;
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0x10; //Cursor/display shift; cursor move
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0xFE;
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0x0C; //Display On; cursor off; do not blink
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0xFE;
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0x01; //Clear display
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//Begin normal operations
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