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TABLE 17.1 PIN
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HITACHI 44780 LCD DRIVER PINOUT DESCRIPTION
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Ground Vcc Contrast voltage R/S Instruction/register select R/W Read/write LCD registers E Clock D0 D7 Data pins
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most critical decision to be made for an LCD interface application. Eight-bit mode is best used when speed is required in an application and at least 10 I/O pins are available. Fourbit mode requires a minimum of 6 bits. To wire a microcontroller to an LCD in 4-bit mode, just the top 4 bits (DB4 7) are written to, with rst the high nybble followed by the low nybble (which will be described in the next section). The R/S bit is used to select whether data or an instruction is being transferred between the microcontroller and the LCD. If the bit is set, then the byte at the current LCD cursor position can be read or written. When the bit is reset, either an instruction is being sent to the LCD or the execution status of the last instruction is read back (whether or not it has completed). The different instructions available for use with the 44780 are shown in Table 17.2, and the bit descriptions for the different commands are Set cursor move direction: ID Increment the cursor after each byte written to display if set S Shift display when byte written to display
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Data R/W R/S E
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Figure 17.11 The Hitachi 44780 based LCD data write waveform.
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TABLE 17.2 R/S R/W
HITACHI 44780 BASED LCD CONTROLLER COMMANDS D7 D6 D5 D4 D3 D2 D1 D0 INSTRUCTION/ DESCRIPTION
4 0 0 0 0 0 0 0 0 0 1
5 0 0 0 0 0 0 0 0 1 0
14 0 0 0 0 0 0 0 1 BF H
13 0 0 0 0 0 0 1 A * H
12 0 0 0 0 0 1 A A * H
11 0 0 0 0 1 DL A A * H
10 0 0 0 1 SC N A A * H
9 0 0 1 D RL F A A * H
8 0 1 ID C * * A A * H
7 1 * S B * * A A * H
Pins Clear display Return cursor and LCD to home position Set cursor move direction Enable display/cursor Move cursor/shift display Reset/set interface length Move cursor to CGRAM Move cursor to display Poll the busy ag Write hex character to the display at the current cursor position Read hex character at the current cursor position on the display
*Not used/ignored. This bit can be either 1 or 0.
Enable display/cursor: D Turn display on(1)/off(0) C Turn cursor on(1)/off(0) B Cursor blink on(1)/off(0) Move cursor/shift display: SC Display shift on(1)/off(0) RL Direction of shift right(1)/left(0) Set interface length: DL Set data interface length 8(1)/4(0) N Number of display lines 1(0)/2(1) F Character font 5 Poll the busy ag: BF This bit is set while the LCD is processing 10(1)/5 7(0)
LCDs
Move cursor to CGRAM/display: A Address Read/write ASCII to the display: H Data Reading data back is best used in applications that require data to be moved back and forth on the LCD (such as in applications that scroll data between lines). The busy ag can be polled to determine when the last instruction sent has completed processing. For most applications, there really is no reason to read from the LCD. I usually tie R/W to ground and just wait the maximum amount of time for each instruction (4.1 ms for clearing the display or moving the cursor/display to the home position; 160 s for all other commands). As well as making my application software simpler, this also frees up a microcontroller pin for other uses. Different LCDs execute instructions at different rates, and to avoid problems later on (such as if the LCD is changed to a slower unit), I recommend just using the maximum delays listed here. In terms of options, I have never seen a 5 10 LCD display. This means that the F bit in the SetInterface instruction always should be reset (equal to 0). Before you can send commands or data to the LCD module, the module must be initialized. For 8-bit mode, this is done using the following series of operations:
1 2 3 4 5
Wait more than 15 ms after power is applied. Write 0x030 to LCD and wait 5 ms for the instruction to complete. Write 0x030 to LCD and wait 160 s for the instruction to complete. Write 0x030 again to LCD and wait 160 s or poll the busy ag. Set the operating characteristics of the LCD: Write SetInterface length. Write 0x010 to turn off the display. Write 0x001 to clear the display. Write set cursor move direction to set cursor behavior bits. Write enable display/cursor to enable display and optional cursor.
In describing how the LCD should be initialized in 4-bit mode, I will specify writing to the LCD in terms of nybbles. This is so because initially, just single nybbles are sent (and not two, which make up a byte and a full instruction). As I mentioned earlier, when a byte is sent, the high nybble is sent before the low nybble, and the E pin is toggled each time 4 bits are sent to the LCD. To initialize in 4-bit mode, the following sequence of commands is sent:
1 2 3 4 5
Wait more than 15 ms after power is applied. Write 0x03 to LCD and wait 5 ms for the instruction to complete. Write 0x03 to LCD and wait 160 s for instruction to complete. Write 0x03 again to LCD and wait 160 s (or poll the busy ag). Set the operating characteristics of the LCD: Write 0x02 to the LCD to enable 4-bit mode.
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