LCD layout
Row 1 = positions 0..15 (dec)Row 2 = positions 64..79 (dec)
Instruction set
| Instruction | Code | Description | Execution time** | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RS | R/W | DB7 | DB6 | DB5 | DB4 | DB3 | DB2 | DB1 | DB0 | |||
| Clear display | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | Clears display and returns cursor to the home position (address 0). | 1.64mS |
| Cursor home | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | * | Returns cursor to home position (address 0). Also returns display being shifted to the original position. DDRAM contents remains unchanged. | 1.64mS |
| Entry mode set | 0 | 0 | 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 |
| Display On/Off control | 0 | 0 | 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 |
| Cursor/display shift | 0 | 0 | 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 |
| Function set | 0 | 0 | 0 | 0 | 1 | DL | N | F | * | * | Sets interface data length (DL), number of display line (N) and character font(F). | 40uS |
| Set CGRAM address | 0 | 0 | 0 | 1 | CGRAM address | Sets the CGRAM address. CGRAM data is sent and received after this setting. | 40uS | |||||
| Set DDRAM address | 0 | 0 | 1 | DDRAM address | Sets the DDRAM address. DDRAM data is sent and received after this setting. | 40uS | ||||||
| Read busy-flag and address counter | 0 | 1 | BF | CGRAM / DDRAM address | Reads Busy-flag (BF) indicating internal operation is being performed and reads CGRAM or DDRAM address counter contents (depending on previous instruction). | 0uS | ||||||
| Write to CGRAM or DDRAM | 1 | 0 | write data | Writes data to CGRAM or DDRAM. | 40uS | |||||||
| Read from CGRAM or DDRAM | 1 | 1 | read data | Reads data from CGRAM or DDRAM. | 40uS | |||||||
- DDRAM = Display Data RAM.
- CGRAM = Character Generator RAM.
- DDRAM address corresponds to cursor position.
- * = Don't care.
- ** = Based on Fosc = 250kHz.
| Bit name | Setting / Status | |
|---|---|---|
| I/D | 0 = Decrement cursor position | 1 = Increment cursor position |
| S | 0 = No display shift | 1 = Display shift |
| D | 0 = Display off | 1 = Display on |
| C | 0 = Cursor off | 1 = Cursor on |
| B | 0 = Cursor blink off | 1 = Cursor blink on |
| S/C | 0 = Move cursor | 1 = Shift display |
| R/L | 0 = Shift left | 1 = Shift right |
| DL | 0 = 4-bit interface | 1 = 8-bit interface |
| N | 0 = 1/8 or 1/11 Duty (1 line) | 1 = 1/16 Duty (2 lines) |
| F | 0 = 5x7 dots | 1 = 5x10 dots |
| BF | 0 = Can accept instruction | 1 = Internal operation in progress |
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